| #511 | Proceedings of the Institution of Electrical Engineers, Part A, Power engineering. -- London : Institution of Electrical Engineers, 1955-1962. -- ISSN 0369-8882 print. -- ISSN 2054-040X online |
| #512 | Proceedings of the Institution of Electrical Engineers, Part B, Electronic and communication engineering, including radio engineering. -- London : Institution of Electrical Engineers, 1955-1962. -- ISSN 0369-8890 print. -- ISSN 2054-0418 online |
| #513 | Proceedings of the Institution of Electrical Engineers, Part C, Monographs. -- London : Institution of Electrical Engineers, 1955-1962. -- ISSN 0369-8904 print. -- ISSN 2054-0426 online |
| #514 | Proceedings of the National Academy of Sciences of the United States of America. -- Washington : National Academy of Sciences, 1914-. -- ISSN 0027-8424 print. -- ISSN 1091-6490 online |
| #515 | Proceedings of the Physical Society. -- London : Physical Society, 1926-1948. -- ISSN 0959-5309 |
| #516 | Proceedings of the Physical Society, Section B. -- London : Physical Society, 1949-1957. -- ISSN 0370-1301 |
| #517 | Proceedings of the Physical Society, Section A. -- London : Physical Society, 1949-1957. -- ISSN 0370-1298 |
| #518 | Proceedings of the Physical Society. -- London : Institute of Physics and the Physical Society, 1958-1967. -- ISSN 0370-1328 |
| #519 | Proceedings of the Physical Society of London. -- London : Physical Society, 1874-1926. -- ISSN 1478-7814 |
| #520 | Proceedings of the Rhodesian of Engineers. -- Velká Británie : Salisbury : Rhodesian Institution of Engineers, 1965-1967 |