U.S. Bureau of the Census. Population Characteristics, Series P-20, 1971, 1979

U.S. Bureau of the Census. Population Characteristics, Series P-20, 1971, 1979, Box: 204, Folder: 13. Julian Samora Papers, 24426265. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/389941 Accessed September 27, 2026.