- Abomination
- Agarves, Buer (Aide to Alia Atreides, CoD)
- Al-Harba, Harq (Playwright)
- Al-Harba Question, The
- Ampoliros, Legend of
- Amtal or Amtal Rule
- Aramsham, Otto (Sardaukar Captain, Dune)
- Arrakeen, Conservatory
- Arrakeen, Palace
- Arrakis, Astronomy
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- Arrakis, Atmosphere
- Arrakis, Ecology
- Arrakis, Geology
- Arrakis, Oxygen Saga
- Assassin's Handbook
- Atreides, Lady Alia
- Atreides, Lady Chani
- Atreides, Ghanima
- Atreides, House
- Atreides, Jessica
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- Atreides, Leto I
- Atreides, Leto II
- Atreides, Minotauros (Father of Leto I)
- Atreides, Moneo
- Atreides, Paul
- Atreides, Siona
- Atreides-Corrino, Irulan
- Axolotl tank
- Azhar Book
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