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- A.C. Gilbert Company8
- Absorption spectra1
- Adam Hilger Ltd.1
- African Americans--Health and hygiene1
- Agricultural chemicals2
- Agriculture2
- American Agricultural Chemical Company2
- American Aniline Products1
- Ammeters1
- Ampro Industries, Inc.1
- Analgesia1
- Analgesics4
- Analytical chemistry2
- Analytical chemistry--Instruments1
- Aniline1
- Aspirin4
- Astronomical instruments1
- Astronomy1
- Badische Anilin- & Soda-Fabrik5
- Bausch & Lomb Optical Company5