The primitive salt production of Lake Texcoco, Mexico

Ola Apenes • 1944

The 'Tlateles' of Lake Texcoco

Ola Apenes • 1943

Table for determination of Maya Calendar Round positions

Ola Apenes • 1937

Abbreviated method for calculating Maya calendar round dates1

Ola Apenes • 1937

Possible derivation of the 260 day period of the Maya calendar

Ola Apenes • 1936