| #631 | Proceedings of the Nova Scotian Institute of Science. -- Halifax : Nova Scotian Institute of Science, 1930-. -- ISSN 0078-2521 |
| #632 | Proceedings of the Romanian Academy, Series A, Mathematics, physics, technical sciences, information science. -- Bucuresti : Pub. House of the Romanian Academy, 2000-. -- ISSN 1454-9069 |
| #633 | Proceedings of the Royal Irish Academy, Section A, Mathematical and physical sciences. -- Dublin : Royal Irish Academy, 1902-1997. -- ISSN 0035-8975 |
| #634 | Proceedings of the Royal Society of Edinburgh. -- Edinburgh : Neill and Co., 1844-1941. -- ISSN 0370-1646 |
| #635 | Proceedings of the Royal Society of Edinburgh, Sect. A, Mathematical and Physical Sciences. -- Edinburgh : Royal Society of Edinburgh, 1942-. -- ISSN 0080-4541 |
| #636 | Proceedings of the Royal Society of London, Series A, Mathematical and physical sciences. -- London : Royal Society, 1934-1990. -- ISSN 0080-4630 |
| #637 | Proceedings of Vibration Problems. -- Warszawa : Panstwowe Wydawnictwo Naukowe, 1959-1974. -- ISSN 0032-9576 |
| #638 | Progress of mathematics. -- Allahabad : Academy of Progress of mathematics. -- ISSN 0555-4330 |
| #639 | Publicaciones del Instituto de matematica y estadistica. -- Montevideo : Universidad de la Republica, 1946-. -- ISSN 0373-1383 |
| #640 | Publicacions matematiques. -- Barcelona : Universitat Autonoma de Barcelona, 1988-. -- ISSN 0214-1493 |