92. Square timber-reinforced hole in hillside; print captioned, '"LA LEONA IRON MINE, Tunnel No 1, in 281 feet. Property of GUERRERO DEVELOPMENT CO."

92. Square timber-reinforced hole in hillside; print captioned, '"LA LEONA IRON MINE, Tunnel No 1, in 281 feet. Property of GUERRERO DEVELOPMENT CO.", Box: 1. James E. Long Photograph Collection, 352928987. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/416591 Accessed September 26, 2026.