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- Absinthe1
- Acetaminophen1
- Adrenaline1
- Air quality management1
- Airships1
- Alchemy1
- Alchemy in art3
- Allington, Robert, 1935-20061
- Aluminum1
- American Civil War (United States : 1861-1865)1
- American Cyanamid Company1
- Amphetamines1
- Anesthesia1
- Arsenic1
- Arsenic--Toxicology1
- Art, Soviet1
- Art--Conservation and restoration2
- Aspirin1
- Atomic bomb--Research1
- Barnes, Albert C. (Albert Coombs), 1872-19511