Papers relating to M.A. Hanna's effort to extend Morro Velho's life,, 1950s

Papers relating to M.A. Hanna's effort to extend Morro Velho's life,, 1950s, Box: 120, Folder: 7. 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/345395 Accessed September 27, 2026.