Blueprints: Small scale plan of Carmen Mine workings... to accompany report of Frank Ebbutt; Carmen Mine... Longitudinal section showing ore estimated by F. Ebbutt, 1942 December

Blueprints: Small scale plan of Carmen Mine workings... to accompany report of Frank Ebbutt; Carmen Mine... Longitudinal section showing ore estimated by F. Ebbutt, 1942 December, Folder: 3. El Potosí Mining Company Records, 33399703. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/263502 Accessed September 25, 2026.