| #241 | Nachrichten aus Chemie, Technik und Laboratorium. -- Weinheim : VCH Verlagsgesellschaft, 1977-. -- ISSN 0341-5163 |
| #242 | Nová fotografie. -- Praha : Práce, 1950-1952. -- ISSN 1801-4720 |
| #243 | Odpadové fórum. -- Praha : České ekologické manažerské centrum, 1999-. -- ISSN 1212-7779 |
| #244 | Odpady. -- Praha : Economia, 1991-. -- ISSN 1210-4922 |
| #245 | Organic & biomolecular chemistry : An international journal of all areas of organic, physical organic and biomolecular organic chemistry. -- Cambridge : Royal Society of Chemistry, 2003-. -- ISSN 1477-0520 print. -- ISSN 1477-0539 online |
| #246 | Organic process research & development. -- Washington : American Chemical Society, 1997-. -- ISSN 1083-6160 print. -- ISSN 1520-586X online |
| #247 | Organometallics. -- Washington : American Chemical Society, 1982-. -- ISSN 0276-7333 print. -- ISSN 1520-6041 online |
| #248 | PC World. -- Praha : IDG Czech, 1991-2008. -- ISSN 1210-1079 |
| #249 | Performance chemicals. -- Sutton : Reed Business Publication, 1997-1999. -- ISSN 1368-2172 |
| #250 | Personální servis. -- Praha : Sociopress, 1997-. -- ISSN 1211-5835 |