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- Abbaye d'Orval1
- Accra Assembly (Organization)1
- Adams, Roger, 1889-19711
- Aeronautics, Commercial1
- Afghanistan1
- African American scientists3
- African Americans3
- Agricola, Georg, 1494-15551
- Agricultural chemistry3
- Agriculture1
- Alchemists12
- Alchemy4
- Alchemy in art1
- Aluminum1
- American Chemical Society6
- American Revolution Bicentennial (1976)1
- Anguilla1
- Arab Petroleum Congress2
- Arrhenius, Svante, 1859-19272
- Art, Mexican1