| #211 | Conservation. -- Seattle : University of Washington, 2000-. -- ISSN 1936-2145 print. -- ISSN 1936-6779 online |
| #212 | Contemporary problems of ecology. -- Moscow : Nauka, 2008-. -- ISSN 1995-4255 print. -- ISSN 1995-4263 online |
| #213 | Continental shelf research. -- Oxford : Pergamon Press, 1982-. -- ISSN 0278-4343 print. -- ISSN 1873-6955 online |
| #214 | Contributions in biology and geology. -- Milwaukee : The Museum, 1974-. -- ISSN 0160-5313 |
| #215 | Contributions of the Geophisical Institute of the Slovak Academy of Sciences, Series of Meteorology. -- Bratislava : SAV, 1969-1999. -- ISSN 0231-9004 |
| #216 | Cornell focus. -- : Cornell Univ., 1992-2003. -- ISSN 1067-585X |
| #217 | Le Courrier du C.N.R.S. -- Paris : CNRS, 1971-1996. -- ISSN 0153-985X |
| #218 | Current contents, Physical, chemical & earth sciences. -- Philadelphia : Institute for Scientific Information, 1979-. -- ISSN 0163-2574 |
| #219 | Current contents, Engineering, computing & technology. -- Philadelphia : Institute for Scientific Information, 1995-. -- ISSN 1079-1450 |
| #220 | Current contents on diskette with abstracts, Physical, chemical & earth sciences. -- Philadelphia : Institute for Scientific Information, 1989-. -- ISSN 1062-3094 |