| #31 | Aldrichimica acta. -- Milwaukee : Aldrich Chemical, 1968-. -- ISSN 0002-5100 |
| #32 | Állatorvosi lapok. -- Budapest : Magyar Országos Állatorvos-Egyesület, 1903-1944. -- ISSN 0365-3900 |
| #33 | American egg and poultry review. -- New York, 1940- |
| #34 | American journal of medicine. -- Newton : Cahners Publishing, 1946-. -- ISSN 0002-9343 print. -- ISSN 1555-7162 online |
| #35 | American journal of physiology, {The }Consolidated Edition. -- Bethesda : American Physiological Society, 1898-. -- ISSN 0002-9513 |
| #36 | American journal of veterinary research : Fostering global interdisciplinary cooperation in veterinary medical research. -- Chicago : American Veterinary Medical Association, 1940-. -- ISSN 0002-9645 print. -- ISSN 1943-5681 online |
| #37 | American review of tuberculosis. -- Baltimore : National Tuberculosis Association, 1917-1954. -- ISSN 0096-0381 |
| #38 | Anales de la Sociedad Científica Argentina. -- Buenos Aires : Sociedad Científica Argentina, 1876-. -- ISSN 0037-8437 |
| #39 | Anales del Instituto de Biología : Universidad Nacional Autónoma de México. -- Mexico : Universidad Nacional Autónoma de México, 1930-1966. -- ISSN 0076-7174 |
| #40 | Analytical chemistry. -- Washington : American Chemical Society, 1948-. -- ISSN 0003-2700 print. -- ISSN 1520-6882 online |