Encyclopedias, Almanacs, Transcripts, and Maps
- Closed Curves
- Closed Curves
- Closed Deck
- Closure Property
- Closure Property
- Cloud Busting
- Cloven Foot
- Cloverleaf Connections
- Clow, Barbara Hand (1943-)
- Club Mosses
- Club Mosses
- Clyde William Tombaugh
- Clymer, R(euben) Swinburne (1878-1966)
- Coates, James (ca. 1927)
- Coatis
- Cobras, Kraits, Sea Snakes, and Relatives: Elapidae
- Cochrane, David (1949-)
- Cockatoos
- Cockayne syndrome
- Cockayne Syndrome