| #991 | Pig international. -- Mount Morris : Watt Publishing. -- ISSN 0191-8834 |
| #992 | Pig news and information. -- Slough : Commonwealth Agricultural Bureaux, 1980-. -- ISSN 0143-9014 |
| #993 | Plant and soil. -- Dordecht : Kluwer Academic Publishers, 1949-. -- ISSN 0032-079X print. -- ISSN 1573-5036 online |
| #994 | Plant biology. -- Stuttgart : Thieme, 1999-. -- ISSN 1435-8603 print. -- ISSN 1438-8677 online |
| #995 | Plant breeding. -- Berlin : Blackwell, 1986-. -- ISSN 0179-9541 print. -- ISSN 1439-0523 online |
| #996 | Plant breeding abstracts : an excellent gateway to all current research on plant breeding. -- Wallingford : CAB International Information Service, 1930-. -- ISSN 0032-0803 |
| #997 | Plant breeding and genetics newsletter. -- Vienna : International Atomic Energy Agency, 1998-. -- ISSN 1564-2569 |
| #998 | Plant Breeding and Seed Science. -- Radzików : Plant Breeding and Acclimatization Institute, 1996-. -- ISSN 1429-3862 |
| #999 | Plant disease. -- St. Paul : American Phytopathological Society, 1980-. -- ISSN 0191-2917 print. -- ISSN 1943-7692 online |
| #1000 | Plant physiology. -- Washington : American Society of Plant Physiologists, 1926-. -- ISSN 0032-0889 print. -- ISSN 1532-2548 online |