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- Accum, Friedrich Christian, 1769-18381
- Acid-base chemistry2
- Adet, Pierre-Auguste, 1763-18323
- Aeronautics4
- Agrostemma1
- Air-pumps2
- Airships10
- Alchemists3
- Alchemy93
- Alchemy in art10
- Alchemy--Early works to 180059
- Alchemy--Manuscripts2
- Alchemy--Religious aspects10
- Alcoholic beverages1
- Alkalies1
- Anatomy1
- Andalusite1
- Anemones5
- Anglo-Dutch War (1652-1654)3
- Anglo-Saxon chronicle1