| #641 | Cancer treatment reports. -- Washington : US Government Printing Office, 1976-1987. -- ISSN 0361-5960 |
| #642 | Carcinogenesis. -- Oxford : Oxford University Press, 1980-. -- ISSN 0143-3334 print. -- ISSN 1460-2180 online |
| #643 | Cardiologia. -- Roma : Società italiana di cardiologia, 1982-1999. -- ISSN 0393-1978 |
| #644 | Cardiology. -- Basel : Karger, 1970-. -- ISSN 0008-6312 print. -- ISSN 1421-9751 online |
| #645 | Cardiology letters. -- Bratislava : Slovenská kardiologická spoločnosť, 2011-. -- ISSN 1338-3655 print. -- ISSN 1338-3760 online |
| #646 | Cardiovascular research. -- London : British Medical Association, 1967-. -- ISSN 0008-6363 |
| #647 | Cardiovascular surgery. -- Oxford : Elsevier, 1993-2003. -- ISSN 0967-2109 print. -- ISSN 1479-0653 online |
| #648 | Cardiovascularia. -- München : Urban und Vogel, 1995-2004. -- ISSN 1430-838X |
| #649 | Caries research. -- Basel : Karger, 1967-. -- ISSN 0008-6568 print. -- ISSN 1421-976X online |
| #650 | Causa subita. -- Praha : International Medical Publications, 1998-. -- ISSN 1212-0197 |