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- Forests and forestry--Oregon--Coos County--Maps2
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- Mines and mineral resources--Colorado--Leadville--Maps.2
- Gannett, Henry, 1846-191414
- Geological Survey (U.S.). Annual report12
- Douglas, Edward Morehouse, 1855-19324
- Marshall, R. B. (Robert Bradford), 1867-19494
- Plummer, Fred G. (Fred Gordon), 1864-19134
- Tweedy, Frank, 1854-19374
- Johnson, A. J3
- Julius Bien & Co3
- Matthes, François, 1874-19483
- U.S. Coast and Geodetic Survey3
Current results range from 1880 to 1974