Names
- Cangero family1
- Cantacuzene, Princess Julia1
- Carmichael, Leonard1
- Carrie Post1
- Carroll Lathrop Post1
- Carroll Post1
- Carton, Augustus C.1
- Chandor, Mrs. Douglas1
- Charles Rollin Post1
- Charles William Post1
- Chester, Colby, Jr.1
- Citizen's Industrial Association of America1
- Citizens' Industrial Association of America.1
- Climax Corn Company1
- Close, Edward Bennett, 1882-1955.1
- Columbia University1
- Committee for a More Beautiful Capitol1
- Comstock, William Alfred, 1877-1949.1
- Cooley, Mortimer E. (Mortimer Elwyn), 1855-1944.1
- Couzens, James, 1872-1936.1