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- Abbaye d'Orval1
- Académie des sciences (France)1
- Académie nationale de médecine (France)5
- Académie royale des sciences (France)2
- Achard, Franz Carl, 1753-18211
- Acid-base chemistry1
- Advertising8
- Advertising cards7
- Aeronautics25
- Aeronautics, Commercial1
- Aeronautics, Military1
- Afghanistan1
- African American scientists1
- Agricultural chemistry1
- Air1
- Airplanes4
- Airships21
- Albertus, Magnus, Saint, 1193?-12801
- Alchemists3
- Alchemy2