Regionalization of the United States on a Precipitation Basis

Helpful suggestions concerning a preliminary edition of this article were received from E. A. Ackerman, C. F. Brooks, R. M. Harper, C. D. Harris, E. E. Lackey, J. K. Rose, G. T. Trewartha, and J. R. Whitaker. Acknowledgement is also gratefully made to the National Youth Administration for the assistance of Jerome Holtel (typing) and Eldon Jann (drafting). ' N. M. Fenneman: Physiographic Divisions of the United States, Revised. These Annals, Vol. 18 (1928), 261-353. : Physiography of the Western United States, 534 pp., New York, 1931. : Physiography of the Eastern United States, 714 pp., New York, 1938. 2 C. F. Marbut: Soils of the United States. U.S.D.A. Atlas of American Agriculture, Pt. 14, Washington, 1935. H. H. Bennett: Soil Erosion in the United States. In Soil Conservation, 1009 pp., New York, 1939. 3 H. L. Shantz and R. Zon: N-atural Vegetation. Atlas of American Agriculture, loc. cit., Sec. E, 1924. B. E. Livingston and F. Shreve: Generalized Vegetation Map of the United States. Carnegie Instn. Publ. 284, 1921. 4 A. E. Parkins: Temperature Regions. These Annals, Vol. 16 (1926), 151-165. Mark Jefferson: Standard Seasons. Ibid., Vol. 28 (1938), 1-12. Richard Hartshorne: Six Standard Seasons of the Year. Ibid., 165-178. 5 W. Van Royen: Climatic Regions of North America. Monthly Weather Review, Vol. 55 (1927), 315-319. C. W. Thornthwaite: Climates of North America According to a New Classification. Geographical Review, Vol. 21 (1931), 633-655. H. M. Kendall: Notes on Climatic Boundaries in the Eastern United States. Geographical Review, Vol. 25 (1935), 117-124. G. T. Trewartha: Climates of North America. Frontispiece of Introduction to Weather and Climate, New York, 1937. E. A. Ackerman: The K6ppen Classification of Climates of North America. Geographical Review, Vol. 31 (1941), 105-111. 6 J. B. Kincer: Precipitation and Humidity. Atlas of American Agriculture, loc. cit., Sec. A of Part II, Climate, 1922. : Climate and Weather Data for the United States. U. S. Dept. of Agriculture Yearbook for 1941, Washington, D. C., 1941

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