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- 3M Company1
- 4-H clubs3
- A.C. Gilbert Company21
- AGRIS (Information retrieval system)1
- AIDS (Disease)2
- AIDS (Disease)--Patients1
- AIDS (Disease)--Research1
- ALGOL (Computer program language)1
- AT & T (Firm)1
- AT & T Bell Laboratories3
- AZT (Drug)2
- Aaron, August1
- Abalones1
- Abbaye d'Orval1
- Abbe, Robert, 1851-19281
- Abbott Laboratories4
- Abbott, Gardner1
- Abegg, R. (Richard), 1869-19108
- Abelson, Philip Hauge, 1913-20041
- Abernethy, John, 1764-18313