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- Bushaw, Gordon.1
- Dingus, Rick, 1951-1
- Gardner, Alexander, 1821-1882.1
- Geographical Surveys West of the 100th Meridian (U.S.)1
- Hillers, John K., 1843-1925.1
- Jackson, William Henry, 1843-1942.1
- Klett, Mark, 1952-1
- Nimmo, Joseph, 1837-19091
- O'Sullivan, Timothy H., 1840-1882.1
- Rephotographic Survey Project.1
- Russell, Andrew J.1
- United States Geological Exploration of the Fortieth Parallel1