| #501 | ASEA Journal. -- Vasteras : Allmaenna Svenska Elektriska Aktiebolaget, 1924-. -- ISSN 0001-2459 |
| #502 | ASHRAE journal : The magazine of The American Society of Heating, Refrigerating and Air-conditioning Engineers. -- New York : American Society of Refrigerating Engineers, 1959-. -- ISSN 0001-2491 print. -- ISSN 1943-6637 online |
| #503 | ASLE transactions. -- Park Ridge : American Society of Lubrication Engineers, 1958-1987. -- ISSN 0569-8197 |
| #504 | Aslib book guide : A monthly list of recommended scientific and technical books. -- London : Aslib, 1992-. -- ISSN 1368-2067 |
| #505 | Aslib book list : A monthly list of selected books published in the fields of science, technology, medicine and the social sciences. -- London : Aslib, 1935-. -- ISSN 0001-2521 |
| #506 | Aslib information. -- London : Aslib, 1973-1994. -- ISSN 0305-0033 |
| #507 | Aslib proceedings. -- London : Aslib, 1949-. -- ISSN 0001-253X print. -- ISSN 1758-3748 online |
| #508 | Assembly automation : the international journal of assembly technology and management. -- Bingley : Emerald, 1980-. -- ISSN 0144-5154 print. -- ISSN 1758-4078 online |
| #509 | Astrofizika. -- Jerevan : Akademia nauk Armanskoj SSR, 1965-. -- ISSN 0571-7132 |
| #510 | Astronautica acta. -- New York : Pergamon Press, 1955-1973. -- ISSN 0004-6205 |