95. Timber-reinforced square entrance into hillside; print captioned "LA LEONA IRON MINE, Tunnel No 4, in 92 feet. Property of GUERRERO DEVELOPMENT CO."

95. Timber-reinforced square entrance into hillside; print captioned "LA LEONA IRON MINE, Tunnel No 4, in 92 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/416594 Accessed September 26, 2026.