| #2231 | Proceedings. -- London : Royal Society, 1990-1996. -- ISSN 0962-8444 |
| #2232 | Proceedings, Section A. Mathematics. -- Edinburgh : Royal Society of Edinburgh, 1974-. -- ISSN 0308-2105 |
| #2233 | Proceedings in print. -- [Arlington] : [Proceedings in Print], 1964-1997. -- ISSN 0032-9568 |
| #2234 | Proceedings of A. Razmadze Mathematical Institute. -- Tbilisi : GCI Publishing House, 1994-. -- ISSN 1512-0007 |
| #2235 | Proceedings of the Academy of Natural Sciences of Philadelphia. -- Philadelphia : Academy of Natural Sciences of Philadelphia, 1841-. -- ISSN 0097-3157 print. -- ISSN 1938-5293 online |
| #2236 | Proceedings of the American Philosophical Society. -- Philadelphia : The Society, 1838-. -- ISSN 0003-049X |
| #2237 | Proceedings of the British Academy. -- Oxford : Oxford University Press, 1905-. -- ISSN 0068-1202 |
| #2238 | Proceedings of the California Academy of Sciences. -- San Francisco : California Academy of Sciences, 1907-. -- ISSN 0068-547X |
| #2239 | Proceedings of the Estonian Academy of Sciences, Chemistry. -- Tallinn : Estonian academy publishers, 1990-. -- ISSN 1406-0124 |
| #2240 | Proceedings of the Indian National Scientific Academy, Pt. A. Physical sciences. -- New Delhi : Indian National Sceince Academy, 1970-. -- ISSN 0370-0046 |