| #2671 | Onkologická péče. -- Praha : Bristol-Myers Squibb, 1997-2008. -- ISSN 1214-5602 print. -- ISSN 1802-7407 online |
| #2672 | Onkologická revue. -- Praha : Current Media, s.r.o., 2014-. -- ISSN 2464-7195 |
| #2673 | Onkologie. -- Olomouc : Solen, 2007-. -- ISSN 1802-4475 print. -- ISSN 1803-5345 online |
| #2674 | Onkopipeline. -- München : Urban u. Vogel, 2008-. -- ISSN 1866-5861 print. -- ISSN 1866-587X online |
| #2675 | Operative Orthopädie und Traumatologie. -- Munchen : Springer, 1989-. -- ISSN 0934-6694 print. -- ISSN 1439-0981 online |
| #2676 | Operative techniques in cardiac & thoracic surgery. -- Philadelphia : Saunders, 1996-1998. -- ISSN 1085-5637 print. -- ISSN 1876-4770 online |
| #2677 | Operative techniques in general surgery. -- Philadelphia : W.B. Saunders, 1999-2008. -- ISSN 1524-153X print. -- ISSN 1558-383X online |
| #2678 | Operative techniques in neurosurgery. -- Philadelphia : W.B. Saunders, 1998-2005. -- ISSN 1092-440X print. -- ISSN 1557-9409 online |
| #2679 | Operative techniques in orthopaedics. -- Philadelphia : W.B. Saunders, 1991-. -- ISSN 1048-6666 print. -- ISSN 1558-3848 online |
| #2680 | Operative techniques in otolaryngology-head and neck surgery. -- Philadelphia : W.B. Saunders, 1990-. -- ISSN 1043-1810 print. -- ISSN 1557-9395 online |