| #241 | Arquivos do Instituto Bacteriologico Camara Pestana. -- Lisboa : Instituto Bacteriologico camara Pestana, 1906-. -- ISSN 0365-2998 |
| #242 | Arquivos do Instituto Biológico. -- Sao Paulo : Instituto Biológico, 1934-. -- ISSN 0020-3653 print. -- ISSN 1808-1657 online |
| #243 | Arthritis and rheumatism. -- Hoboken : Wiley-Liss, 1958-. -- ISSN 0004-3591 print. -- ISSN 1529-0131 online |
| #244 | Arthropod - Plant Interactions. -- Dordrecht : Springer, 2007-. -- ISSN 1872-8855 print. -- ISSN 1872-8847 online |
| #245 | Arthropod structure & development. -- Oxford : Elsevier, 2000-. -- ISSN 1467-8039 print. -- ISSN 1873-5495 online |
| #246 | Arthropod Systematics & Phylogeny. -- Dresden : Museum für Tierkunde, 2006-. -- ISSN 1863-7221 |
| #247 | Atoll research bulletin. -- Washington : Smithsonian Press, 1951-. -- ISSN 0077-5630 print. -- ISSN 1943-9660 online |
| #248 | Atti de la Societa Toscana di Scienze Naturali, Memoire. Serie B. -- Pisa : Grafiche Pacini Editore, 1948-. -- ISSN 0365-7450 |
| #249 | Australian journal of biological sciences. -- Melbourne : Commonwealth Scientific and Industrial Research Organization, 1953-1988. -- ISSN 0004-9417 |
| #250 | Australian journal of botany. -- Melbourne : Commonwealth Scientific and Industrial Research Organization, 1953-. -- ISSN 0067-1924 print. -- ISSN 1444-9862 online |