| #241 | Ochrana přírody : Časopis státní ochrany přírody. -- Praha : Environs, 1992-. -- ISSN 1210-258X |
| #242 | Online information review. -- Bradford : MCB University Press., 2000-. -- ISSN 1468-4527 |
| #243 | Organic reactivity : international journal on quantitative structure-reactivity and -property relationships. -- Tartu : Tartu University, 1974-. -- ISSN 0131-8314 |
| #244 | Organometallics. -- Washington : American Chemical Society, 1982-. -- ISSN 0276-7333 print. -- ISSN 1520-6041 online |
| #245 | Pamiatky a múzeá. -- Bratislava : Slovenské národné múzeum-Národné muzejné centrum, 1952-. -- ISSN 1335-4353 print. -- ISSN 1336-0949 online |
| #246 | Perspectives in drug discovery and design. -- Leiden : ESCOM Science Publishers, 1993-2000. -- ISSN 0928-2866 |
| #247 | Petroleum and Coal. -- Bratislava : Slovnaft VÚRUP, 1995-. -- ISSN 1335-3055 |
| #248 | Petroleum refiner. -- Houston : Gulf Pub. Co., 1942-1961. -- ISSN 0096-6517 |
| #249 | Petroleum science and technology. -- Monticello : Marcel Dekker, 1997-. -- ISSN 1091-6466 |
| #250 | Die Pharmazie. -- Eschborn : Govi-Verl., 1946-. -- ISSN 0031-7144 |