| #5551 | Petroleum economist. -- London : Petroleum Economist, 1974-. -- ISSN 0306-395X |
| #5552 | Petroleum review. -- London : Institute of Petroleum, 1968-. -- ISSN 0020-3076 |
| #5553 | Petroleum times. -- Maidstone : Whitehall Press, 1981-1988. -- ISSN 0263-3590 |
| #5554 | Petroleum times energy report. -- Swanley : Nexus Business Communications, 1991-1998. -- ISSN 1461-0361 |
| #5555 | Petrologia. -- Moskva : Nauka, 1993-. -- ISSN 0869-5903 |
| #5556 | Pharma + Food : Hygiene - Produktion - Ausrüstung. -- Heidelberg : Hüthig, 1998-. -- ISSN 1434-8942 |
| #5557 | PharmaTec. -- Würzburg : Vogel Business Media, 2008- |
| #5558 | Philips journal of research. -- Eidhoven : Philips Research Laboratories, 1978-. -- ISSN 0165-5817 |
| #5559 | Philips research reports. -- Eindhoven : Philips Gloeilampenfabriken, 1945-1977. -- ISSN 0031-7918 |
| #5560 | Philosophical magazine. -- London : Taylor and Francis, 1798-1977. -- ISSN 0031-8086 |