Geologic Maps to Accompany Report by L.C. Graton and Guy N. Bjorge,, 1929 April

Geologic Maps to Accompany Report by L.C. Graton and Guy N. Bjorge,, 1929 April, Box: OV, Folder: 1. Saint John d'El Rey Mining Company Records, 1984-12. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/347601 Accessed September 25, 2026.