Processos de Extracao e Beneficiamento de Ouro Prata e Arsenico

Processos de Extracao e Beneficiamento de Ouro Prata e Arsenico, Box: Roll, Folder: 1. Saint John d'El Rey Mining Company Records, 1984-12. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/347611 Accessed September 26, 2026.