| #271 | Problemi na geografijata. -- Sofiâ : Bulgarska akademiâ na naukite, 1974-. -- ISSN 0204-7209 |
| #272 | Problemy fiziki atmosfery. -- Leningrad : Izdatel´stvo Leningradskogo universiteta, 1963-. -- ISSN 0552-2056 |
| #273 | Procedia earth and planetary science. -- Amsterdam : Elsevier, 2009-. -- ISSN 1878-5220 online |
| #274 | Proceedings of the NIPR Symposium on Polar Biology. -- Tokyo : National Institute of Polar Research, 1987-1998. -- ISSN 0914-563X |
| #275 | The Professional geographer : Forum and journal of the Association of American geographers. -- Hamilton : Association of American Geographers, 1946-. -- ISSN 0033-0124 print. -- ISSN 1467-9272 online |
| #276 | Progress in human geography. -- London : Arnold, 1977-. -- ISSN 0309-1325 |
| #277 | Progress in oceanography. -- Oxford : Pergamon Press, 1963-. -- ISSN 0079-6611 print. -- ISSN 1873-4472 online |
| #278 | Progress in physical geography. -- London : Sage, 1977-. -- ISSN 0309-1333 print. -- ISSN 1477-0296 online |
| #279 | Przeglad Geograficzny. -- Warszawa : Panstwowe Wydawnictwo Naukowe, 1918-. -- ISSN 0033-2143 |
| #280 | Rad Matice srpske. -- Novi Sad : Matica Srpska, 1826-. -- ISSN 0350-042X |