| #241 | Preparative biochemistry & biotechnology. -- New York : M. Dekker, 1996-. -- ISSN 1082-6068 print. -- ISSN 1532-2297 online |
| #242 | Proceedings. -- Baltimore : Waverly Press, 1974-. -- ISSN 0197-016X |
| #243 | Proceedings of the Japan Academy, Series A Mathematical sciences. -- Tokyo : Japan Academy, 1977-. -- ISSN 0386-2194 |
| #244 | Proceedings of the Japan Academy, Series B, Physical and biological sciences. -- Tokyo : Japan Academy, 1977-. -- ISSN 0386-2208 |
| #245 | 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 |
| #246 | Proceedings of the Society for Experimental Biology and Medicine. -- Malden : Blackwell Science, 1904-2000. -- ISSN 0037-9727 |
| #247 | Protein science. -- New York : Cold Spring Harbor Laboratory Press, 1992-. -- ISSN 0961-8368 print. -- ISSN 1469-896X online |
| #248 | Proteins : structure, function, and genetics. -- New York : Wiley, 1986-. -- ISSN 0887-3585 |
| #249 | Reviews of Pure and Applied Chemistry. -- Melbourne : Royal Australian Chemical Institute, 1951-1972. -- ISSN 0034-687X |
| #250 | Science in China, Series B, Chemistry, life sciences & earth sciences. -- Peking : Chinese Academy of Sciences, 1989-. -- ISSN 1001-652X |