Blueprints Nos. 3210-3221 by D. V. Fennessy for semi-underground ore bins at No. 1 shaft, 1932 May 15

Blueprints Nos. 3210-3221 by D. V. Fennessy for semi-underground ore bins at No. 1 shaft, 1932 May 15, Folder: 6. 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/263505 Accessed September 25, 2026.