| #261 | Polar bioscience. -- Tokyo : Nat. Inst. of Polar Research, 1999-2006. -- ISSN 1344-6231 |
| #262 | Polar geography. -- Palm Beach : V.H. Winston and Son, 1995-. -- ISSN 1088-937X print. -- ISSN 1939-0513 online |
| #263 | Polar meteorology and glaciology. -- Tokyo : National Institute of Polar Research, 1998-. -- ISSN 1344-3437 |
| #264 | Polar Record. -- Cambridge : Scott Polar Research Institute, 1931-. -- ISSN 0032-2474 print. -- ISSN 1475-3057 online |
| #265 | Political geography. -- Oxford : Butterworth-Heinemann, 1992-. -- ISSN 0962-6298 print. -- ISSN 1873-5096 online |
| #266 | Polski Przeglad Kartograficzny. -- Warszawa : Polskie Towarzystwo Geograficzne, 1969-. -- ISSN 0324-8321 |
| #267 | Population. -- Paris : Institut national d'études démographiques, 1946-. -- ISSN 0032-4663 |
| #268 | Population index. -- Princeton : Princeton University, Office of Population Research, 1937-1999. -- ISSN 0032-4701 |
| #269 | Post-Soviet geography and economics. -- Palm Beach : Winston, 2000-. -- ISSN 1088-9388 |
| #270 | Prager Landwirthschaftliches Wochenblatt. -- Česká Republika : Praha : b. t, 1879-1895 |