Names
- Clark, John Bates, 1847-1938.1
- Clements, William L. (William Lawrence), 1861-1934.1
- Cleveland, Cincinnati, Chicago, and St. Louis Railway Company.1
- Cocker, Benjamin Franklin, 1821-1883.1
- Colorado and Southern Railway.1
- Commons, John Rogers, 1862-1945.1
- Conant, Charles A. (Charles Arthur), 1861-1915.1
- Cooley family.1
- Cooley, Charles Horton, 1864-19291
- Cooley, Lyman Edgar, 1850-1917.1
- Cooley, Mary Horton, 1830-1890.1
- Cooley, Mortimer E. (Mortimer Elwyn), 1855-1944.1
- Cope, E. D. (Edward Drinker), 1840-1897.1
- Cornell University1
- Cumerian Club1
- Cummings, Joseph, 1817-1890.1
- Currier, A. O.1
- D'Ooge, Martin Luther, 1839-1915.1
- Dana, James Dwight, 1813-1895.1
- Darwin1