| #541 | News report. -- Washington : National Academy of Sciences, 1951-1999. -- ISSN 0027-8432 |
| #542 | Nickel. -- Toronto : Nickel Development Institute, 1985-. -- ISSN 0829-8351 |
| #543 | Nonlinear analysis: Hybrid systems. -- Oxford : Elsevier, 2007-. -- ISSN 1751-570X print. -- ISSN 1878-7460 online |
| #544 | Notices of the American Mathematical Society. -- Providence : American Mathematical Society, 1954-. -- ISSN 0002-9920 print. -- ISSN 1088-9477 online |
| #545 | Nové Agro. -- Hradec Králové : Agro tisk, 2007-. -- ISSN 1802-7903 |
| #546 | Objevy techniky : populární technický měsíčník. -- Praha : Masarykova akademie práce, 1939-1949. -- ISSN 2533-7165 |
| #547 | Ocean engineering. -- Elmsford : Pergamon Press, 1968-. -- ISSN 0029-8018 print. -- ISSN 1873-5258 online |
| #548 | Oil engine and gas turbine. -- London : Temple Press |
| #549 | Oil & gas science and technology. -- Paris : Éditions Technip, 1999-. -- ISSN 1294-4475 |
| #550 | Oldtimer : odborný magazín pro znalce historických vozidel. -- Praha : IBS motorpress, 2013-. -- ISSN 1805-9082 |