Subject
- Catocala ilia1
- Catocala muliercula1
- Catocala ultronia1
- Cecropia Silkmoth1
- Celastrina1
- Celastrina ladon1
- Ceratomia catalpae1
- Charred Dagger Moth1
- Chesapeake Bay (Md. and Va.) -- Maps -- Early works to 18001
- Chlosyne gorgone1
- Choristoneura1
- Choristoneura parallela1
- Chorochlamys chloroleucaria1
- Christian art and symbolism1
- Chronology, Historical – Early works to 18001
- Chronology, Historical--Early works to 18001
- Church history--Middle Ages, 600-15001
- Cisseps fulvicollus1
- Citheronia regalis1
- Civil law – Italy1