Anderson, Clifford N. Mayan Time Measures. From Journal of Calendar Reform (1940): 17-22, 1940

Anderson, Clifford N. Mayan Time Measures. From Journal of Calendar Reform (1940): 17-22, 1940, Box: 85. George I. Sánchez Papers, 23866736. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/541666 Accessed September 27, 2026.