Encyclopedias, Almanacs, Transcripts, and Maps
- 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
- Clay, Cassius Marcellus, Jr.
- Clay, Clement Claiborne
- Clayton, Henry De Lamar
- Clazomenae
- Clear Lake
- Clearchus
- clearcutting
- Clearfield
- clearstory