Names
- Colorado and Southern Railway.1
- Commons, John Rogers, 1862-1945.1
- Conant, Charles A. (Charles Arthur), 1861-1915.1
- Cooley, Charles Horton, 1864-1929.1
- Cooley, Lyman Edgar, 1850-1917.1
- Cooley, Mortimer E. (Mortimer Elwyn), 1855-1944.1
- Cooley, Thomas McIntyre, 1824-1898.1
- Cornell University1
- D'Ooge, Martin Luther, 1839-1915.1
- Dawson, William Mercer Owens, 1853-1916.1
- Day, Edmund Ezra, 1883-1951.1
- Dernberger, Robert F.1
- Detroit United Railway.1
- Dewey, Davis Rich, 1858-1942.1
- Dewey, John 1859-1952.1
- Dewey, John, 1859-1952.1
- Dixon, Frank Haigh, 1869-.1
- Dixon, Frank Haigh, 1869-1944.1
- Douglas, Paul H. (Paul Howard), 1892-1976.1
- Durand, Edward Dana, 1871-1