Rowland, Donal-1932. The Sonora frontier of New Spain,George P. Hammond (editor), in New Spain and the Anglo-American west, Lancaster, Pa., 2 vols

Rowland, Donal-1932. The Sonora frontier of New Spain,George P. Hammond (editor), in New Spain and the Anglo-American west, Lancaster, Pa., 2 vols, Box: 8, Folder: 33. Campbell W. Pennington Papers, 33036864. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/279308 Accessed September 26, 2026.