Geology and Ore Deposits of Morro Velho Mine,, 1954 June

Geology and Ore Deposits of Morro Velho Mine,, 1954 June, Box: 144, Folder: 13. 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/346926 Accessed September 27, 2026.