- Cappella musicale Pontificia.1
- Children.1
- Christmas--Washington (D.C.)1
- Circus performers.1
- Clothing and dress--History--20th century.1
- Collier Trophy.1
- Commencement ceremonies.1
- Confederate States of America--History.1
- Coolidge, Calvin, 1872-1933--Homes and haunts.1
- Coolidge, Calvin, 1872-1933.✖[remove]65
- Coolidge, Calvin, 1908-1924.1
- Coolidge, Grace Goodhue, 1879-1957--Family.1
- Coolidge, Grace Goodhue, 1879-1957.27
- Coolidge, John, 1906-2000.3
- Cornerstone laying.1
- Costume.2
- Cox, Channing H. (Channing Harris), 1879-1968.1
- Crowds.1
- Daughters of the American Revolution.2
- Davis, Dwight Filley, 1879-1945.1