"A Note on the Cultural Affiliations of Northern Mexican Nomads," American Anthropologist, 37, No.4, 702-706., 1935, Box: 123, Folder: 5. Morris Edward Opler papers, 14-25-3238. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/240660 Accessed February 20, 2026.