| #211 | Canadian journal of mathematics. -- Toronto : University of Toronto, 1949-. -- ISSN 0008-414X |
| #212 | Canadian journal of statistics. -- Montreal : Statistical Science Association of Canada, 1973-. -- ISSN 0319-5724 |
| #213 | Canadian mathematical bulletin : Canadien de mathématiques. -- Montreal : Canadian Mathematical Congress, 1958-. -- ISSN 0008-4395 |
| #214 | Carpathian Journal of Mathematics. -- Baia Mare : North University of Baia Mare, 2003-. -- ISSN 1584-2851 print. -- ISSN 1843-4401 online |
| #215 | Central European journal for operations research and economics. -- Bratislava : University of Economics, 1992-1998. -- ISSN 1335-1443 |
| #216 | Central European journal of operations research. -- Heidelberg : Physica, 1999-. -- ISSN 1435-246X print. -- ISSN 1613-9178 online |
| #217 | Ciencias matematicas. -- La Habana : Universidad de la Habana, 1980-. -- ISSN 0256-5374 |
| #218 | Collectanea mathematica. -- Barcelona : Universidad de Barcelona, 1948-. -- ISSN 0010-0757 print. -- ISSN 2038-4815 online |
| #219 | Colloquium Mathematicum. -- Warszawa : Instytut Matematyczny PAN, 1947-. -- ISSN 0010-1354 print. -- ISSN 1730-6302 online |
| #220 | Combinatorica. -- Budapest : Springer, 1981-. -- ISSN 0209-9683 print. -- ISSN 1439-6912 online |