"Documents Concerning Commerce in Durango, 1772," Department of Geography, University of California, Berkeley, Photocopy

"Documents Concerning Commerce in Durango, 1772," Department of Geography, University of California, Berkeley, Photocopy, Box: 12, Folder: 6. Personal papers of Michael M. Swann, PP 636. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/513195 Accessed November 11, 2025.