Publisher
- Central Intelligence Agency86
- Central Pacific and Western Pacific Railroads Commission1
- Central Statistical Board8
- Central Statistical Committee1
- Centralization of Heavy Industry in United States, Special Committee to Investigate, Senate5
- Cessions Committee199
- Chaplains Office of Chief of1
- Charleston Navy-Yard1
- Charts14
- Chemical Corps (Army)51
- Chemical Warfare School9
- Chemical Warfare Service43
- Chemistry Bureau917
- Chemistry Bureau (Agriculture Department)49
- Chemistry Division73
- Chemistry and Soils Bureau940
- Chemistry, Bureau of65
- Chesapeake and Delaware Canal Commission (War Department)1
- Chicago World's Fair Centennial Commission2
- Chickamauga and Chattanooga National Military Park Commission19