Encyclopedias, Almanacs, Transcripts, and Maps
- Clotilda
- Cloud Chemistry
- Clupeiformes (Herrings)
- cluster, stellar
- clutch, electromagnetic
- Co-Composting
- Coal Bed Methane
- Coal Gasification
- Coal Washing
- Coal, Consumption of
- Coal, Production of
- Coal, Transportation and Storage of
- Coastal Society, the
- Coastal Zone Management Act (1972)
- Coastlines
- Coatlicue
- Cobb, Ty (Tyrus) Raymond
- Cobras, Kraits, Seasnakes, Death Adders, and Relatives (Elapidae)
- Cocculiniformia (Deep-Sea Limpets)
- cockchafer