2. Subseries, León Mining Co., 1909, 1911

2. Subseries, León Mining Co., 1909, 1911, Box: 2, Folder: 21. Thomas Wentworth Peirce, Jr. Papers, 30605864. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/279041 Accessed September 27, 2026.