| #6121 | Proceedings of the International Commission on Glass. -- Velká Británie : London : Isaac Pitman / London : Butterworths Scientific Publications, 1954-1957, 1957. -- ISSN 0534-8269 |
| #6122 | Proceedings of the Iowa Academy of Science. -- Des moines : Iowa Academy of Science, 1889-1987. -- ISSN 0085-2236 |
| #6123 | Proceedings of the IRE. -- New York : Institute of Radio Engineers, 1939-1962. -- ISSN 0096-8390 |
| #6124 | Proceedings of the IREE Australia. -- Australie : Sydney : Institution of Radio and Electronics Engineers Australia, 1979-1980 |
| #6125 | Proceedings of the Japan Academy, Series A Mathematical sciences. -- Tokyo : Japan Academy, 1977-. -- ISSN 0386-2194 |
| #6126 | Proceedings of the Japan Academy, Series B, Physical and biological sciences. -- Tokyo : Japan Academy, 1977-. -- ISSN 0386-2208 |
| #6127 | Proceedings of the London Mathematical Society. -- London : London Mathematical Society, 1865-. -- ISSN 0024-6115 print. -- ISSN 1460-244X online |
| #6128 | 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 |
| #6129 | Proceedings of the Physical Society. -- London : Physical Society, 1926-1948. -- ISSN 0959-5309 |
| #6130 | Proceedings of the Physical Society, Section B. -- London : Physical Society, 1949-1957. -- ISSN 0370-1301 |