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- Associative rings 9
- Assumpció de la Mare de Déu 2
- Assumption of the Blessed Virgin Mary 2
- Assyro-Babylonian civilization 2
- Asteques 1
- Asteroides 11
- Asteroids 11
- Astènia 1
- Asthenia 1
- Asthma 67
- Asthma in children 7
- Aston, Francis William, 1877-1945 1
- Astrocytes 38
- Astrofísica 218
- Astrofísica del plasma 1
- Astrofísica nuclear 27
- Astrofísica relativista 1
- Astrolabe 1
- Astrolabis 2
- Astrologia 2