| #21 | Agriculture, ecosystems & environment. -- Amsterdam : Elsevier, 1983-. -- ISSN 0167-8809 print. -- ISSN 1873-2305 online |
| #22 | Agro-Ecosystems. -- Amsterdam : Elsevier, 1974-1982. -- ISSN 0304-3746 print. -- ISSN 1878-2582 online |
| #23 | Agroecology and sustainable food systems. -- Philadelphia : Taylor & Francis, 2013-. -- ISSN 2168-3565 print. -- ISSN 2168-3573 online |
| #24 | Agrometeorologický zpravodaj. -- Praha : Český hydrometeorologický ústav, 1981-2010. -- ISSN 2464-7950 |
| #25 | Air and Water Pollution. -- Oxford : Pergamon, 1962-1966. -- ISSN 0568-3408 |
| #26 | Air Pollution Abstracts. -- UNITED STATES : Research Triangle Park, N.C. [etc.] U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards [, 1971-1976. -- ISSN 0027-5956 |
| #27 | The Air pollution consultant. -- Lakewood : McCoy and Associates, 1991-. -- ISSN 1058-6628 print. -- ISSN 1878-674X online |
| #28 | Air repair. -- Pittsburgh : Air Pollution and Smoke Prevention Association of America, 1952-1954. -- ISSN 0096-6665 print. -- ISSN 2374-7633 online |
| #29 | Air & waste. -- Pittsburgh : The Association, 1993-1994. -- ISSN 1073-161X |
| #30 | Alpine Botany. -- : Birkhaeuser Science, 2005-. -- ISSN 1664-221X online |