- CRS report for Congress3
- Campbell, Charles3
- Carnegie-Illinois Steel Corporation3
- Case, Clifford P. (Clifford Philip), 1904-19823
- Cavazos, Lauro3
- Cayuga Indians3
- Childs, Marquis W. (Marquis William), 1903-19903
- Chrysler Corporation3
- Clark Equipment Company3
- Classic Teleproductions3
- Clay, Lucius D. (Lucius DuBignon), 1897-19783
- Cleary and Associates3
- Clouse and Associates/ Fremstad Group3
- Connally, Tom, 1877-19633
- Cooper, John Sherman, 1901-19913
- Crossroads GPS3
- Democratic National Committee (U.S.)3
- Devall, Guy Bossini3
- Dodd, Christopher J. (Christopher John), 1944-3
- Dodd, Thomas J. (Thomas Joseph), 1907-19713
