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- Awards 9
- Axiom of choice 5
- Axioma d'elecció 5
- Axiomatic set theory 4
- Axiomes 10
- Axioms 10
- Axion 2
- Axió 2
- Axons 25
- Ayala, Francisco, 1906-2009 1
- Ayamonte (Andalusia) 1
- Aymara Indians 4
- Azara, José Nicolás de, 1730-1804 1
- Azeotrope 2
- Aziridines 4
- Azithromycin 1
- Azitromicina 1
- Aznalcóllar (Andalusia) 1
- Azo compounds 4
- Azo groups 1