| #521 | Proceedings of the Physical Society. -- London : Institute of Physics and the Physical Society, 1958-1967. -- ISSN 0370-1328 |
| #522 | Proceedings of the Physical Society of London. -- London : Physical Society, 1874-1926. -- ISSN 1478-7814 |
| #523 | Proceedings of the Rhodesian of Engineers. -- Velká Británie : Salisbury : Rhodesian Institution of Engineers, 1965-1967 |
| #524 | Proceedings of the Royal Society of London, Series B, Biological Sciences. -- London : Royal Society, 1934-1990. -- ISSN 0080-4649 |
| #525 | Proceedings of the Royal Society of London. -- London : Royal Society, 1855-1904. -- ISSN 0370-1662 |
| #526 | Process instrumentation. -- Velká Británie : London : United Trade Press, 1972 |
| #527 | Process Technology International. -- Velká Británie : London : IPC Industrial Press,, 1972-1973. -- ISSN 0144-185X |
| #528 | Prodoc. -- Německo : Darmstadt : Hoppenstedt, 1973-1975. -- ISSN 0170-0804 |
| #529 | Prodoc Product-Documentation Kunststofftechnik. -- Německo : Darmstadt : Hoppenstedt, 1976-1977. -- ISSN 0170-0812 |
| #530 | Production engineer. -- London : Institution of Production Engineers, 1960-1989. -- ISSN 0032-9851 print. -- ISSN 2053-7859 online |