| #671 | Citologiâ i genetika. -- Kiev : Naukova dumka, 1967-. -- ISSN 0564-3783 |
| #672 | Cleveland Clinic journal of medicine. -- Cleveland : Cleveland Clinic Educational Foundation, 1987-. -- ISSN 0891-1150 print. -- ISSN 1939-2869 online |
| #673 | Cleveland Clinic quarterly. -- Cleveland : Cleveland Clinic Educational Foundation, 1932-1986. -- ISSN 0009-8787 |
| #674 | Climacteric. -- Carnforth : Parthenon, 1998-. -- ISSN 1369-7137 print. -- ISSN 1473-0804 online |
| #675 | Clinica chimica acta. -- Amsterdam : Elsevier, 1956-. -- ISSN 0009-8981 print. -- ISSN 1873-3492 online |
| #676 | Clinical Allergy. -- Oxford : Blackwell Scientific Publications, 1971-1988. -- ISSN 0009-9090 |
| #677 | Clinical and diagnostic laboratory immunology. -- Washington : American Society for Microbiology, 1994-2005. -- ISSN 1071-412X print. -- ISSN 1098-6588 online |
| #678 | Clinical and diagnostic virology. -- Amsterdam : Elsevier Science, 1993-1998. -- ISSN 0928-0197 print. -- ISSN 1873-4901 online |
| #679 | Clinical and experimental allergy. -- Oxford : Blackwell Scientific, 1989-. -- ISSN 0954-7894 print. -- ISSN 1365-2222 online |
| #680 | Clinical and experimental hypertension. -- New York : Marcel Dekker, 1993-. -- ISSN 1064-1963 print. -- ISSN 1525-6006 online |