Hrdlicka, Ales. 1904.Notes on the Indigenous peoples of Sonora, Mexico, American Anthropologist, Vol. 6, pp. 51-89

Hrdlicka, Ales. 1904.Notes on the Indigenous peoples of Sonora, Mexico, American Anthropologist, Vol. 6, pp. 51-89, Box: 9, Folder: 15. Campbell W. Pennington Papers, 33036864. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/279326 Accessed September 26, 2026.