Blueprints: 2.115-A, Hand gate for skiploading device (2copies); 2.115-B, Detail to hand gate for skip loading device (2 copies), 1929 January 24-25

Blueprints: 2.115-A, Hand gate for skiploading device (2copies); 2.115-B, Detail to hand gate for skip loading device (2 copies), 1929 January 24-25, Folder: 4. 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/263503 Accessed September 26, 2026.