Author
- Chemical Warfare School9
- Chemical Warfare Service43
- Chemistry Bureau918
- Chemistry Bureau (Agriculture Department)49
- Chemistry Division73
- Chemistry and Soils Bureau955
- Chemistry, Bureau of65
- Chesapeake and Delaware Canal Commission (War Department)1
- Chicago World's Fair Centennial Commission2
- Chickamauga and Chattanooga National Military Park Commission19
- Chickamauga and Chattanooga National Military Park Commission (War Department)1
- Chickamauga and Chattanooga National Park Commission18
- Chickamauga and Chattanooga National Park Commission (War Department)1
- Chief of Engineers1
- Chief of Ordnance10
- Child Development Office39
- Child Development Services Bureau11
- Child Labor Tax Division1
- Children's Bureau2,591
- Church Claims Board1