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- Manuscripts✖[remove]2
- Typescripts✖[remove]2
- Correspondence1
- Howe, Ernest, 1875-1932✖[remove]2
- Geologists--United States--20th Century2
- Gold miners--United States--20th Century2
- Mining engineers--United States--20th Century✖[remove]2
- Geology--California--Nevada County1
- Geology--West (U.S.)1
- Gold mines and mining--California1
Current results range from 1883 to 1917