| Charles Chiakulas Papers | Abstracts |
| Chicago Union Printers Baseball Association Records | Abstracts |
| Ely Chinoy Papers | Abstracts |
| Louis Ciccone Papers | Abstracts |
| Cigar Makers Union No. 130 Records | Abstracts |
| CIO Department of Education and Research Records | Abstracts |
| CIO Executive Board Minutes and Proceedings | Abstracts |
| CIO Housing Committee: Leo Goodman Records | Abstracts |
| CIO Office of the Secretary-Treasurer Records | Abstracts |
| CIO Washington Office Records | Abstracts |
| Citizens for a United Detroit Records | Abstracts |
| Civil Rights Congress of Michigan Records | Abstracts |
| Charles J. Clark Papers | Abstracts |
| Coalition of Labor Union Women Records | Abstracts |
| Coalition of Labor Union Women: San Francisco Chapter Records | Abstracts |
| Coalition of Labor Union Women: Seattle Chapter Records | Abstracts |
| Coalition of Black Trade Unionists Records | Abstracts |
| Alton Cobb Papers | Abstracts |
| David Cohen Papers | Abstracts |
| Oscar Cohen Papers | Abstracts |
| Ronald Cohen Papers | Abstracts |
| Sanford Cohl Papers | Abstracts |
| John Cole Papers | Abstracts |
| Virgil Collins Papers | Abstracts |
| Columbia Typographical Union No. 101 Records | Abstracts |
| Committee for National Health Insurance Records | Abstracts |
| Commonwealth College Records | Abstracts |
| Concerned Unionists Records | Abstracts |
| Joseph P. Conlin Papers | Abstracts |
| Alexander Cook Papers | Abstracts |
| Stanley Cook Papers | Abstracts |
| William Cook Papers | Abstracts |
| Elmer Cope Papers | Abstracts |
| Minnie F. Corder Papers | Abstracts |
| Frank Cormier and William Eaton Papers | Abstracts |
| Edward Cote Papers | Abstracts |
| Andrew Court Papers | Abstracts |
| Leon Cousens Papers | Abstracts |
| James G. Couser Papers | Abstracts |
| John Craft Papers | Abstracts |
| Harold Cranefield Papers | Abstracts |
| George Crockett Papers | Abstracts |
| Alexander Crosby Papers | Abstracts |
| Jack Crosby Papers | Abstracts |
| James D. Crowe Papers | Abstracts |
| John J. D'Agostino Papers | Abstracts |
| Franz E. Daniel Papers | Abstracts |
| William C. Davis Papers | Abstracts |
| Walter Day Papers | Abstracts |
| Len and Caroline DeCaux Papers | Abstracts |
