"Principal Indian Tribes of North America, simplified from Driver, Cooper, Kirchhoff, Libby, Massey, and Spier", Folder: 6 (oversize), item: 1. Personal papers of James A. Clifton, PP 528. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/164370 Accessed May 17, 2024.