| #321 | Power farming. -- London : Agricultural Press, 1965-1992. -- ISSN 0032-5988 |
| #322 | Prace Instytutu Odlewnictwa. -- Kraków : Instytut odlewnictwa, 1952-1998. -- ISSN 0450-8955 |
| #323 | Praktische Metallographie. -- München : Hanser, 1964-. -- ISSN 0032-678X |
| #324 | Proceedings of the Combustion Institute. -- Pittsburgh : The Institute, 2000-. -- ISSN 1540-7489 print. -- ISSN 1873-2704 online |
| #325 | Proceedings of the Royal Society of London, Series A, Mathematical and physical sciences. -- London : Royal Society, 1934-1990. -- ISSN 0080-4630 |
| #326 | Processing and Application of Ceramics. -- Novi Sad : Faculty of Technology, University of Novi Sad, 2007-. -- ISSN 1820-6131 |
| #327 | Progress in aerospace sciences. -- Oxford : Pergamon Press, 1961-. -- ISSN 0376-0421 print. -- ISSN 1873-1724 online |
| #328 | Przegląd Odlewnictwa. -- Warszawa : Wydawnictwo Czasopism i Ksiazek Technicznych Sigma, 1951-. -- ISSN 0033-2275 |
| #329 | Publicacions matematiques. -- Barcelona : Universitat Autonoma de Barcelona, 1988-. -- ISSN 0214-1493 |
| #330 | Pumps, Pompes, Pumpen. -- Surrey : Trade & Technical Press, 1965-1968. -- ISSN 0033-426X |