| #271 | Prague Medical Report. -- Praha : Karolinum, 2004-. -- ISSN 1214-6994 |
| #272 | Praktický lékař : časopis pro další vzdělávání lékařů. -- Praha : Česká společnost J. Ev. Purkyně, 1921-. -- ISSN 0032-6739 |
| #273 | Praktický rodinný lékař. -- Praha : Aesculapus K-9, 1999. -- ISSN 1212-2238 |
| #274 | La Presse médicale. -- Paris : Masson, 1893-. -- ISSN 0755-4982 |
| #275 | Pro medico. -- München-Gräfelfing : Banaschewski, 1930-1984. -- ISSN 0032-907X |
| #276 | Proceedings of the National Academy of Sciences of the United States of America. -- Washington : National Academy of Sciences, 1914-. -- ISSN 0027-8424 print. -- ISSN 1091-6490 online |
| #277 | Proceedings of the National Science Council, Republic of China, Part B, Life sciences. -- Taipei : National Science Council, 1984-2001. -- ISSN 0255-6596 |
| #278 | Proceedings of the Royal College of Physicians of Edinburgh. -- Edinburgh : Royal College of Physicians of Edinburgh, 1986-2001. -- ISSN 0953-0932 |
| #279 | Proceedings of the Royal Society of Medicine. -- London : Royal Society of Medicine Press, 1907-1977. -- ISSN 0035-9157 |
| #280 | Proceedings of the Society for Experimental Biology and Medicine. -- Malden : Blackwell Science, 1904-2000. -- ISSN 0037-9727 |