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- Letters written by Charles Byron Swope to his wife Gretchen while he was stationed at Fort McDowell on Angel Island in San Francisco Bay, and other family correspondence.
- Creation Date: 1917-1918
- Documents and photographs relating to silver mining operations in Mexico, principally Real del Monte and Pachuca during the periods of British (1824-1849) and Mexican (1849-1906) capitalization and management.
- Creation Date: circa 1825-1983