| #2251 | 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 |
| #2252 | Proceedings of the National Science Council, Republic of China, Part A, Physical science and engineering. -- Taipei : National Science Council, 1984-. -- ISSN 0255-6588 |
| #2253 | Proceedings of the National Science Council, Republic of China, Part B, Life sciences. -- Taipei : National Science Council, 1984-2001. -- ISSN 0255-6596 |
| #2254 | Proceedings of the National Science Council, Republic of China, Part C, Humanities and social sciences. -- Taipei : National Science Council, 1991-. -- ISSN 1018-4473 |
| #2255 | Proceedings of the National Science Council, Republic of China, Part D, Mathematics, science and technology education. -- Taipei : National Science Council, 1991-. -- ISSN 1017-7124 |
| #2256 | Proceedings of the NIPR Symposium on Antarctic Geosciences. -- Tokyo : Nat. Inst. of Polar Research, 1989-1997. -- ISSN 0914-2029 |
| #2257 | Proceedings of the NIPR Symposium on Antarctic Meteorites. -- Tokyo : National Institute of Polar Research, 1988-1996. -- ISSN 0914-5621 |
| #2258 | Proceedings of the NIPR Symposium on Polar Biology. -- Tokyo : National Institute of Polar Research, 1987-1998. -- ISSN 0914-563X |
| #2259 | Proceedings of the NIPR Symposium on Upper Atmosphere Physics. -- Tokyo : National Institute of Polar Research, 1988-1998. -- ISSN 0914-5613 |
| #2260 | Proceedings of the Nova Scotian Institute of Science. -- Halifax : Nova Scotian Institute of Science, 1930-. -- ISSN 0078-2521 |