Encyclopedias, Almanacs, Transcripts, and Maps
- Clark, Jonas Gilman
- Clark, Ramsey
- Clark, Willis Gaylord
- Clarke, Mary Victoria (Novello) Cowden
- Clarke, Walter
- clary
- Clauda
- Claude Michel
- Claude, Jean
- Claudius II
- Clausel, Bertrand
- Clausthal-Zellerfeld
- Clauzel, Bertrand
- Claverhouse, John Graham of
- Clavière, Étienne
- Clavijero, Francisco Javier
- Clavius, Cristoph
- Clawson
- Claxton, Philander Priestly
- clay pan