| #41 | Antarctic science. -- Oxford : Blackwell Scientific, 1989-. --  ISSN 0954-1020 print. --  ISSN 1365-2079 online | 
| #42 | Anzeiger für Schädlingskunde. -- Berlin : Springer, 1999-2003. --  ISSN 1436-5693 print. --  ISSN 1439-0280 online | 
| #43 | Applied catalysis, B, Environmental. -- Amsterdam : Elsevier, 1992-. --  ISSN 0926-3373 print. --  ISSN 1873-3883 online | 
| #44 | Applied ecology abstracts. -- London : Information Retrieval Limited, 1975-1979. --  ISSN 0305-3040 | 
| #45 | Applied organometallic chemistry. -- Harlow : Longman Scientific & Technical, 1987-. --  ISSN 0268-2605 print. --  ISSN 1099-0739 online | 
| #46 | Applied soil ecology. -- Amsterdam : Elsevier, 1994-. --  ISSN 0929-1393 print. --  ISSN 1873-0272 online | 
| #47 | Aqua Viva. -- Schaffhausen : Aqua Viva - Rheinaubund, 2013-. --  ISSN 2296-2506 | 
| #48 | Aquatic ecology. -- Dordrecht : Kluwer Academic Publishers, 1997-. --  ISSN 1386-2588 print. --  ISSN 1573-5125 online | 
| #49 | Architectural design. -- London : Academy Editions, 1947-. --  ISSN 0003-8504 print. --  ISSN 1554-2769 online | 
| #50 | Archives of environmental contamination and toxicology. -- New York : Springer, 1973-. --  ISSN 0090-4341 print. --  ISSN 1432-0703 online |