D E Nelson
Dados Biográficos
| ID | 16687 |
|---|---|
| NOME | D E Nelson |
| PRENOMES | D E |
| SOBRENOME | Nelson |
| ASSINATURA | NELSON D E |
| AFILIAÇÕES | Simon Fraser University |
| ORCID | 0000-0002-5676-4451 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 43 |
| TOTAL DE CITAÇÕES | 819 |
| TOTAL COMO AUTOR | 43 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1975 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 13 |
Nursing Education Supporting Inclusive Skin and Hair Care
INTRODUCTION: Inclusive hair and skin care are essential for culturally congruent health care; however, hospitalized patients with textured hair and skin of color experience limited access to appropriate products. Nursing staff also report gaps in knowledge related to culturally responsive care of hair and skin. This initiative aimed to improve care through product access and education. METHODS: A quality improvement project was conducted at a Mi…
A virtual reality intervention to increase interracial empathy and upstander behaviors in nursing leaders
Appendix 1
The protocol for collagen extract used in the Greenland Isotope Project as discussed in the papers comprising the Journal of North Atlantic Special Volume 3, Greenland Isotope Project: Diet in Norse Greenland AD 1000–AD 1450, is described here in detail
Stable Carbon and Nitrogen Isotopic Measurements of the Wild Animals Hunted by the Norse and the Neo-Eskimo People of Greenland
Isotopic measurements of the terrestrial and marine wild animal species of greatest importance to Greenlandic Norse and Neo-Eskimo people were obtained to provide a solid basis for undertaking isotopic dietary analyses of these two human groups. The samples studied were animal bones from archaeological excavations of Norse and Neo-Eskimo middens. As expected, the values for the terrestrial and marine species were found to have characteristic isot…
Isotopic Analyses of The Domestic Animals of Norse Greenland
To provide a basis for the isotopic dietary study of the Greenland Norse, and as an interesting study in itself, measures of the stable carbon (δ13C) and nitrogen (δ15N) isotope ratios were obtained for 118 samples of archaeological bone from 6 species of the Norse domestic animals. These samples were obtained from museum faunal collections representing archaeological excavations of 10 Norse sites, five in each of the two Norse settlements in Gre…
A First Isotopic Dietary Study of the Greenlandic Thule Culture
The isotopic dietary method has been applied to samples of some 65 Thule Culture individuals from existing archaeological collections of Greenlandic human skeletal material. The aim was to use the Greenlandic Thule Culture as a test of the isotopic method, in that we know they were heavily dependent on marine resources, and should thus provide a direct measure of the isotopic values for humans consuming almost entirely marine protein. The sites f…
An Isotopic Analysis of the Diet of the Greenland Norse
Our understanding of the Norse dietary adaptations to their Greenlandic home comes primarily from sparse historical records, from what is known of the Norse dietary economy in other North Atlantic lands, and from zooarchaeological examinations of the animal bones found in the various excavations of Norse Greenlandic sites which have taken place over the past century. To obtain more detailed information on the diets of the Norse settlers in Greenl…
Stable nitrogen isotopic examination of Norse sites in the Western settlement of Greenland
Correlation between modern plant δ15N values and activity areas of Medieval Norse farms
Patterns of plant δ15N values on a Greenland Norse farm
Modern plant δ15N values reflect ancient human activity
Radiocarbon Dating Caribou Antler and Bone
Old archaeological radiocarbon dating lore has it that caribou antler and bone give different dating results, and that for some fundamental reason antler is unreliable as a dating material. We tested this idea by measuring radiocarbon concentrations in the bone and antler of two caribou (one recent, one ancient) for which the antler was still attached to the cranium. No significant differences were found. Thus, it seems that this old myth is grou…
Aberrant Radiocarbon Dates on an Inuit Arrowhead
Apparently aberrant radiocarbon dates on a Thule culture antler artefact lead to the conclusion that this tool was made of material that was already ancient at the time of manufacture. This finding documents a potential problem in the interpretation of radiocarbon dates on Arctic cultural materials
Radiocarbon and Stable Isotope Analyses of Archaeological Bone Consolidated with Hide Glue
We tested a simple method for removing a collagen-based glue preservative from bone destined for radiocarbon and stable isotope analyses. The method is sufficient for bone samples from which only stable isotope measurements are required. For 14 C dating, such samples of age less than about 10 ka can be adequately dated, but for older samples, the circumstances must be carefully evaluated
A radiocarbon chronology for the Eastern Lapita frontier in Tonga
We present a series of 31 AMS radiocarbon dates on charcoal samples from six sites with eastern Lapita and Polynesian plain ware occupations in the Ha'apai Islands of Tonga. These dates indicate an initial Lapita settlement beginning no earlier than 2850 cal BP, with a rapid transition to a Polynesian plain ware phase by 2650 cal BP at the latest. Comparison of the Ha'apai chronology to radiocarbon dates from elsewhere in Tonga and in Western Pol…
Stratigraphy, Radiocarbon Dating, and Culture History of Charlie Lake Cave, British Columbia
Three seasons of fieldwork at Charlie Lake Cave, British Columbia, have revealed a sequence of stratified deposits that spans the Late Pleistocene and entire Holocene. Analyses of sediments, radiocarbon dates, faunal remains, and artifacts show that the site was first occupied by people at about 10,500 B.P. when local environments were more open than today. By 9500 B.P., boreal forest had moved into the area, and human use of the site was minimal…
The Effects of Lipids in Stable Carbon Isotope Analysis and the Effects of NaOH Treatment on the Composition of Extracted Bone Collagen
Radiocarbon Dates for Beeswax Figures in the Prehistoric Rock Art of Northern Australia
Accelerator mass spectrometry radiocarbon ages have been taken for a test suite of small samples of material removed from some of the ‘beeswax’art figures found in rock shelters in northern Australia. The results indicate that we can reliably date this unique form of rock art with no noticeable damage. We had not expected to find figures of any great antiquity, and so we were surprised to find that the ages obtained spanned the time period from t…
Vermilion Lakes Site
The Vermilion Lakes site in Banff National Park, Alberta, has yielded cultural remains suggesting a possible sheep-hunting focus during the Paleoindian period and providing evidence for windbreaks or shelters dating as early as 10,300 B.P. Debris flows at this site have separated and preserved six or more cultural components dating between the mid-eleventh and mid-tenth millennia before present. Paleoenvironmental evidence suggests that most of t…
A Simple Field Kit for Identifying C 4 Plants
We have developed a simple field kit for identifying C4 plants, the use of which requires little technical training. The system has proven very useful for surveying plants in areas for which carbon isotopic dating and dietary studies are to be undertaken
A Simple Field Kit for Identifying C 4 Plants
Smoking, HIV infection, and gay men in the United States
Correspondence to D A Arday. Dr Arday is with the Epidemie Intelligence Service. On 13 August 1992, the Wall Street Journal announced, The tobacco industry, after be ing beaten back in its controversial efforts to woo blacks and women, may be turning its marketing muscle on another minority: homosexuals.1 Philip Morris Inc reportedly planned to unveil its new Benson & Hedges Special Kings brand using advertisements in the national gay press. Homo…
Dating the Cassis rufa shell from the Mousterian levels of the Grotte du Prince, Monaco
A fragment of Cassis rufa shell, in modern times a species of the Indian Ocean, was reliably reported from the deep Mousterian deposits excavated at the beginning of the century from the Grotte du Prince, Monaco. Because its known habitat is so distant and exotic, there has always been question about the specimen's authenticity. A radiocarbon determination shows it to be recent, and no evidence for long-distance movement of shell in the European …
Second thoughts on a rock-art date
D.E. Nelson, radiocarbon scientist in the group which reported early dates for rock-art at two Australian sites in ANTIQUITY 64 (1990), reports a further study which leads him to withdraw the published date for one, at Laurie Creek (Northern Territory). As he notes, is co-authors in the 1990 paper are not all in agreement with his present view. The other site dated in 1990, Judds Cavern (Tasmania), is not addressed in this further report
Younger Dryas Climatic Reversal in Northeastern USA? AMS Ages for an Old Problem
Late-glacial macrofossils from a 10-m core from Alpine Swamp, New Jersey, were radiocarbon dated using accelerator mass spectrometry (AMS). The arrival of the first trees to the area following deglaciation is indicated by maximum percentages of spruce pollen and a date of 12,290 ± 440 yr B.P. on a single spruce needle. Subsequent spread of deciduous hardwoods was followed by the expansion of boreal taxa, including spruce ( Picea ), fir ( Abies ),…
Improved Collagen Extraction by Modified Longin Method
A re-evaluation of the Longin collagen-extraction method shows that a lower reflux temperature reduces degradation of protein (“collagen”) remnants. This allows additional purification through ultrafiltration to isolate the >30kDalton fraction of the reflux product
Marine and Terrestrial Protein in Prehistoric Diets on the British Columbia Coast
Accelerator radiocarbon dating of human blood proteins in pigments from Late Pleistocene art sites in Australia
Absolute dating of rock paintings has always used an indirect means, generally by dating material in strata sealing or overlying the pictures. AMS dating of very small carbon samples now allows direct determination of the age of an organic portion in the matter of the picture itself
C Background Levels in An Accelerator Mass Spectrometry System
The levels and sources of the measurement background in an AMS 14 C dating system have been studied in detail. The relative contributions to the total background from combustion, graphitization, storage, handling, and from the accelerator were determined by measuring the C concentrations in samples of anthracite coal ranging in size from 15μg to 20mg. The results show that, for the present system, the uncertainty in the background is greater than…
Carbon isotope measurement techniques for bone collagen
A radiocarbon chronology for the Eastern Lapita frontier in Tonga
We present a series of 31 AMS radiocarbon dates on charcoal samples from six sites with eastern Lapita and Polynesian plain ware occupations in the Ha'apai Islands of Tonga. These dates indicate an initial Lapita settlement beginning no earlier than 2850 cal BP, with a rapid transition to a Polynesian plain ware phase by 2650 cal BP at the latest. Comparison of the Ha'apai chronology to radiocarbon dates from elsewhere in Tonga and in Western Pol…
Carbon Isotope Ratios in Palaeodiet
Palaeodiet of humans can be determined using stable carbon isotope ratios of bone collagen. Differences in δ 13 C‐values between individuals in a population may be due to real differences in diet, or alternatively, they could be due to age‐ or sex‐dependent differences in the physiologically controlled fractionation of carbon isotopes between food and collagen. The dependence of this fractionation on age and sex was tested in a study of 50 indivi…
Modern plant δ15N values reflect ancient human activity
The Effects of Lipids in Stable Carbon Isotope Analysis and the Effects of NaOH Treatment on the Composition of Extracted Bone Collagen
Second thoughts on a rock-art date
D.E. Nelson, radiocarbon scientist in the group which reported early dates for rock-art at two Australian sites in ANTIQUITY 64 (1990), reports a further study which leads him to withdraw the published date for one, at Laurie Creek (Northern Territory). As he notes, is co-authors in the 1990 paper are not all in agreement with his present view. The other site dated in 1990, Judds Cavern (Tasmania), is not addressed in this further report
Patterns of plant δ15N values on a Greenland Norse farm
Radiocarbon Dates for Beeswax Figures in the Prehistoric Rock Art of Northern Australia
Accelerator mass spectrometry radiocarbon ages have been taken for a test suite of small samples of material removed from some of the ‘beeswax’art figures found in rock shelters in northern Australia. The results indicate that we can reliably date this unique form of rock art with no noticeable damage. We had not expected to find figures of any great antiquity, and so we were surprised to find that the ages obtained spanned the time period from t…
Stratigraphy, Radiocarbon Dating, and Culture History of Charlie Lake Cave, British Columbia
Three seasons of fieldwork at Charlie Lake Cave, British Columbia, have revealed a sequence of stratified deposits that spans the Late Pleistocene and entire Holocene. Analyses of sediments, radiocarbon dates, faunal remains, and artifacts show that the site was first occupied by people at about 10,500 B.P. when local environments were more open than today. By 9500 B.P., boreal forest had moved into the area, and human use of the site was minimal…
Stable nitrogen isotopic examination of Norse sites in the Western settlement of Greenland
Correlation between modern plant δ15N values and activity areas of Medieval Norse farms
Radiocarbon Dating Blood Residues on Prehistoric Stone Tools
We report here the first radiocarbon dating of blood residues on prehistoric stone tools. The residues found on two stone artifacts were subjected to various exploratory biochemical techniques to identify the species from which they were derived and to separate a suitable sample for dating by accelerator mass spectrometry. Although these techniques need much further development and detailed testing, the ages obtained in this first study were cons…
Vermilion Lakes Site
The Vermilion Lakes site in Banff National Park, Alberta, has yielded cultural remains suggesting a possible sheep-hunting focus during the Paleoindian period and providing evidence for windbreaks or shelters dating as early as 10,300 B.P. Debris flows at this site have separated and preserved six or more cultural components dating between the mid-eleventh and mid-tenth millennia before present. Paleoenvironmental evidence suggests that most of t…
Characterization of Pacific Northwest Coast Obsidian by X‐ray Fluorescence Analysis
S Several geological sources of obsidian in the Pacific Northwest have been characterized by means of their trace element concentrations, as measured by X‐ray fluorescence analysis. The technique is fast and completely non‐destructive, making it well‐suited for identifying the sources of obsidian from which artifacts were fabricated
Accuracy and Precision in Dating Microgram Carbon Samples
The accuracy of AMS radiocarbon determinations on very small samples has been tested by measuring a suite of microgram-sized samples of a known-age material. The total measurement precision for the smallest sample (50μg) was found to be ± 3% and the precision improved with larger sample size. The accuracies of the measurements were found to be within the measurement precisions
Stable Carbon and Nitrogen Isotopic Measurements of the Wild Animals Hunted by the Norse and the Neo-Eskimo People of Greenland
Isotopic measurements of the terrestrial and marine wild animal species of greatest importance to Greenlandic Norse and Neo-Eskimo people were obtained to provide a solid basis for undertaking isotopic dietary analyses of these two human groups. The samples studied were animal bones from archaeological excavations of Norse and Neo-Eskimo middens. As expected, the values for the terrestrial and marine species were found to have characteristic isot…
Radiocarbon and Stable Isotope Analyses of Archaeological Bone Consolidated with Hide Glue
We tested a simple method for removing a collagen-based glue preservative from bone destined for radiocarbon and stable isotope analyses. The method is sufficient for bone samples from which only stable isotope measurements are required. For 14 C dating, such samples of age less than about 10 ka can be adequately dated, but for older samples, the circumstances must be carefully evaluated
Isotopic Analyses of The Domestic Animals of Norse Greenland
To provide a basis for the isotopic dietary study of the Greenland Norse, and as an interesting study in itself, measures of the stable carbon (δ13C) and nitrogen (δ15N) isotope ratios were obtained for 118 samples of archaeological bone from 6 species of the Norse domestic animals. These samples were obtained from museum faunal collections representing archaeological excavations of 10 Norse sites, five in each of the two Norse settlements in Gre…
A First Isotopic Dietary Study of the Greenlandic Thule Culture
The isotopic dietary method has been applied to samples of some 65 Thule Culture individuals from existing archaeological collections of Greenlandic human skeletal material. The aim was to use the Greenlandic Thule Culture as a test of the isotopic method, in that we know they were heavily dependent on marine resources, and should thus provide a direct measure of the isotopic values for humans consuming almost entirely marine protein. The sites f…
An Isotopic Analysis of the Diet of the Greenland Norse
Our understanding of the Norse dietary adaptations to their Greenlandic home comes primarily from sparse historical records, from what is known of the Norse dietary economy in other North Atlantic lands, and from zooarchaeological examinations of the animal bones found in the various excavations of Norse Greenlandic sites which have taken place over the past century. To obtain more detailed information on the diets of the Norse settlers in Greenl…
Memory Effects in an AMS System
A sample with a 14 C concentration estimated to be greater than 30,000 Modern was inadvertently graphitized and measured in an AMS system. No measurable contamination of the cesium sputter ion source was observed. Simple cleaning procedures removed the contamination from the sample preparation system, with the exception of the reaction vessel in which the sample was graphitized. Sample cross-contamination factors were estimated for all of the pre…
Characterization of Pacific Northwest Coast Obsidian by X‐ray Fluorescence Analysis
S Several geological sources of obsidian in the Pacific Northwest have been characterized by means of their trace element concentrations, as measured by X‐ray fluorescence analysis. The technique is fast and completely non‐destructive, making it well‐suited for identifying the sources of obsidian from which artifacts were fabricated
Stable-Carbon Isotope Ratios as a Measure of Marine Versus Terrestrial Protein in Ancient Diets
The stable-carbon isotope ratios for the flesh of marine and terrestrial animals from Canada's Pacific coast differ by 7.9 ± 0.4 per mil, reflecting the ∼ 7 per mil difference between oceanic and atmospheric carbon. This difference is passed on to human consumers. The carbon isotopic values (δ 13 C) for human collagen thus yield direct information on the relative amounts of marine and terrestrial foods in prehistoric diets.
Simon Fraser University Radiocarbon Dates I
The SFU Archaeology Department has constructed a small radiocarbon dating facility to serve its own needs and, to the extent that time is available, the needs of other archaeologists and earth scientists. All dates reported here were processed by our laboratory from October 1979 to September 1980. The 14 C measurements are made using conventional techniques for liquid scintillation counting of benzene. The samples are burned in a Phonon Mark IV c…
Energy-Dispersive X-ray Fluorescence Analysis as a Rapid Method for Identifying Tephras
The use of energy-dispersive X-ray fluorescence analysis (XES) for the routine identification of three tephras (Mazama, Bridge River, Mount St. Helens Yn) commonly found in archeological sites in British Columbia has been investigated. Researchers have often assumed that chemical analysis of bulk samples of glass separates would be hampered by contamination and weathering effects. Our results indicate that XES of bulk glass separates provides a v…
Carbon isotope measurement techniques for bone collagen
Simon Fraser University Radiocarbon Dates II
This list reports measurements made on archaeologic samples by our laboratory from September 1980 to May 1982. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Dates were obtained by liquid scintillation counting of benzene using the laboratory procedure outlined previously (R, 1982, v 24, p 344–351). All dates are expressed in 14 C years relative to ad 1950 based on the L…
Marine and Terrestrial Protein in Prehistoric Diets on the British Columbia Coast
Simon Fraser University Radiocarbon Dates III
This list reports measurements made on archaeologic and geologic samples by our laboratory from June 1982 to December 1983. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Sample preparation techniques and benzene synthesis remain as described previously (R, 1982, v 24, p 344–351). For low organic samples, such as sediments, we now use a combustion tube assembly. These sa…
Radiocarbon Dating Blood Residues on Prehistoric Stone Tools
We report here the first radiocarbon dating of blood residues on prehistoric stone tools. The residues found on two stone artifacts were subjected to various exploratory biochemical techniques to identify the species from which they were derived and to separate a suitable sample for dating by accelerator mass spectrometry. Although these techniques need much further development and detailed testing, the ages obtained in this first study were cons…
Accelerator Radiocarbon Dating at SFU
The Simon Fraser University accelerator mass spectrometry (AMS) facility has now been in semi-routine use since the beginning of 1985. The advantages and limitations for 14 C dating are described
Carbon Isotope Ratios in Palaeodiet
Palaeodiet of humans can be determined using stable carbon isotope ratios of bone collagen. Differences in δ 13 C‐values between individuals in a population may be due to real differences in diet, or alternatively, they could be due to age‐ or sex‐dependent differences in the physiologically controlled fractionation of carbon isotopes between food and collagen. The dependence of this fractionation on age and sex was tested in a study of 50 indivi…
C Background Levels in An Accelerator Mass Spectrometry System
The levels and sources of the measurement background in an AMS 14 C dating system have been studied in detail. The relative contributions to the total background from combustion, graphitization, storage, handling, and from the accelerator were determined by measuring the C concentrations in samples of anthracite coal ranging in size from 15μg to 20mg. The results show that, for the present system, the uncertainty in the background is greater than…
Improved Collagen Extraction by Modified Longin Method
A re-evaluation of the Longin collagen-extraction method shows that a lower reflux temperature reduces degradation of protein (“collagen”) remnants. This allows additional purification through ultrafiltration to isolate the >30kDalton fraction of the reflux product
Radiocarbon Dating of Pollen by Accelerator Mass Spectrometry
Radiocarbon dating of bulk sediments has been the standard method for establishing chronologies in the studies of lake sediment cores which have contributed significantly to our knowledge of late Quaternary paleo-environments. These bulk sediment dates are presumed to be direct ageindicators for the speciments (e.g., pollen or macrofossils) which are actually being studied. However, several recent studies have reinforced long-standing apprehensio…
Accuracy and Precision in Dating Microgram Carbon Samples
The accuracy of AMS radiocarbon determinations on very small samples has been tested by measuring a suite of microgram-sized samples of a known-age material. The total measurement precision for the smallest sample (50μg) was found to be ± 3% and the precision improved with larger sample size. The accuracies of the measurements were found to be within the measurement precisions
Ultra-Small Carbon Samples and the Dating of Sediments
Radiocarbon dates from sediment core samples are usually obtained on the whole organic carbon portion in order to use as little of the valuable sediment as possible. Such measurements may not result in an accurate chronology of the sediment because the material may include carbon from different reservoirs at the time of deposition. The development of AMS techniques for dating ultra-small (20–500 μ g) carbon samples permits dating various componen…
Younger Dryas Climatic Reversal in Northeastern USA? AMS Ages for an Old Problem
Late-glacial macrofossils from a 10-m core from Alpine Swamp, New Jersey, were radiocarbon dated using accelerator mass spectrometry (AMS). The arrival of the first trees to the area following deglaciation is indicated by maximum percentages of spruce pollen and a date of 12,290 ± 440 yr B.P. on a single spruce needle. Subsequent spread of deciduous hardwoods was followed by the expansion of boreal taxa, including spruce ( Picea ), fir ( Abies ),…
Memory Effects in an AMS System
A sample with a 14 C concentration estimated to be greater than 30,000 Modern was inadvertently graphitized and measured in an AMS system. No measurable contamination of the cesium sputter ion source was observed. Simple cleaning procedures removed the contamination from the sample preparation system, with the exception of the reaction vessel in which the sample was graphitized. Sample cross-contamination factors were estimated for all of the pre…
Accelerator radiocarbon dating of human blood proteins in pigments from Late Pleistocene art sites in Australia
Absolute dating of rock paintings has always used an indirect means, generally by dating material in strata sealing or overlying the pictures. AMS dating of very small carbon samples now allows direct determination of the age of an organic portion in the matter of the picture itself
Smoking, HIV infection, and gay men in the United States
Correspondence to D A Arday. Dr Arday is with the Epidemie Intelligence Service. On 13 August 1992, the Wall Street Journal announced, The tobacco industry, after be ing beaten back in its controversial efforts to woo blacks and women, may be turning its marketing muscle on another minority: homosexuals.1 Philip Morris Inc reportedly planned to unveil its new Benson & Hedges Special Kings brand using advertisements in the national gay press. Homo…
Dating the Cassis rufa shell from the Mousterian levels of the Grotte du Prince, Monaco
A fragment of Cassis rufa shell, in modern times a species of the Indian Ocean, was reliably reported from the deep Mousterian deposits excavated at the beginning of the century from the Grotte du Prince, Monaco. Because its known habitat is so distant and exotic, there has always been question about the specimen's authenticity. A radiocarbon determination shows it to be recent, and no evidence for long-distance movement of shell in the European …
Second thoughts on a rock-art date
D.E. Nelson, radiocarbon scientist in the group which reported early dates for rock-art at two Australian sites in ANTIQUITY 64 (1990), reports a further study which leads him to withdraw the published date for one, at Laurie Creek (Northern Territory). As he notes, is co-authors in the 1990 paper are not all in agreement with his present view. The other site dated in 1990, Judds Cavern (Tasmania), is not addressed in this further report
A Simple Field Kit for Identifying C 4 Plants
We have developed a simple field kit for identifying C4 plants, the use of which requires little technical training. The system has proven very useful for surveying plants in areas for which carbon isotopic dating and dietary studies are to be undertaken
A Simple Field Kit for Identifying C 4 Plants
The Effects of Lipids in Stable Carbon Isotope Analysis and the Effects of NaOH Treatment on the Composition of Extracted Bone Collagen
Archaeology and ancient environmental studies (31 obras) · Archaeology (27 obras) · Geography (23 obras) · Geology (22 obras) · Radiocarbon dating (22 obras) · Isotope Analysis in Ecology (18 obras) · Pleistocene-Era Hominins and Archaeology (16 obras) · Chemistry (15 obras) · Geology and Paleoclimatology Research (15 obras) · Paleontology (14 obras)