| #551 | Proceedings of the Journal the Utah Academy of Sciences, Arts and Letters. -- : Utah Academy of Sciences, Arts, and Letters, 1977-1997. -- ISSN 0196-9110 |
| #552 | Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, Series B, Palaeontology, geology, physics, chemistry, anthropology. -- Amsterdam : North-Holland, 1983-1989. -- ISSN 0920-2250 |
| #553 | Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. -- Amsterdam : North-Holland, 1990-1997. -- ISSN 0924-8323 |
| #554 | Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, Series B, Palaeontology, geology, physics and chemistry. -- Amsterdam : North-Holland, 1976-1983. -- ISSN 0023-3366 |
| #555 | Proceedings of the National Science Council, Republic of China, Part D, Mathematics, science and technology education. -- Taipei : National Science Council, 1991-. -- ISSN 1017-7124 |
| #556 | Proceedings of the Nova Scotian Institute of Science. -- Halifax : Nova Scotian Institute of Science, 1930-. -- ISSN 0078-2521 |
| #557 | Proceedings of the Royal Society of Queensland. -- Brisbane : Univ. of Queensland Press, 1884-. -- ISSN 0080-469X |
| #558 | Proceedings of the West Virginia Academy of Sciences. -- Morgantown : West Virginia Academy of Sciences, 1924-. -- ISSN 0096-4263 |
| #559 | Le Progres scientifique. -- Paris : Documentation française, 1961-1981. -- ISSN 0033-0469 |
| #560 | Progress in nuclear energy. -- Oxford : Pergamon, 1977-. -- ISSN 0149-1970 print. -- ISSN 1878-4224 online |