Notarized statement of condition of the Albarradon mine in 1840 made in Warapil at the requests of D. Manuel Berain, manager of the Bonanza ranch by authority of D. Carlos Sanchez Navarro, 1860, May 20-June 4:

Notarized statement of condition of the Albarradon mine in 1840 made in Warapil at the requests of D. Manuel Berain, manager of the Bonanza ranch by authority of D. Carlos Sanchez Navarro, 1860, May 20-June 4:, Box: 1, Item: 2355. Sánchez Navarro Collection of Documents for a History of Texas and Coahuila, 30605850. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/303439 Accessed September 27, 2026.