I. Subgroup, Documents Collected by the Proberts Concerning Mining in Mexico.

I. Subgroup, Documents Collected by the Proberts Concerning Mining in Mexico.. Alan & Lillie M. Probert Collection, 33036851. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/279485 Accessed September 25, 2026.