Names
- Copeland, Royal S. (Royal Samuel), 1868-1938.1
- Coply, Alexander Bennett, 1822-1899.1
- Copper Mines and Mining1
- Cram, Esther Marsh1
- Cram, Esther Marsh.1
- Crary, Isaac Edwin, 1804-1854.1
- Crowley, David Henry, 1882-1
- Cudlip, William B., 1904-1988.1
- Cudlip, William Byrnes, 1904-1
- Cullom, Shelby Moore, 1829-1914.1
- Custer National Monument Association.1
- Custer, George Armstrong, 1839-1876.1
- Cutcheon, Byron M., 1836-1908.1
- Cutcheon, Byron Mac, 1836-19081
- Cutcheon, Sullivan M., 1843-1900.1
- D'Ooge, Martin Luther, 1839-1915.1
- Dabney, W. D.1
- Davis, R. C. (Raymond Cazallis), 1836-1
- Davis, Raymond Cazallis, 1836-1919.1
- Dean, Henry Stewart, 1830-19151