Pseudo-Official List of the Books:
Dune:
1. Dune +
2. Dune Messiah +
3. Children of Dune +
4. God Emperor of Dune +
5. Heretics of Dune +
6. Chapterhouse: Dune +
7. Hunters of Dune
8. Sandworms of Dune
9. Sands of Dune
Prelude to Dune:
1. House Atredies +
2. House Harkonnen +
3. House Corrino
Legends of Dune:
1. The Butlerian Jihad +
2. The Machine Crusade
3. The Battle of Corrin
Heroes of Dune:
1. Paul of Dune +
2. The Winds of Dune +
Great Schools of Dune:
1. The Sisterhood of Dune +
2. Mentats of Dune
3. Navigators of Dune
Dune: Caladan Trilogy
1. The Duke of Caladan
2. The Lady of Caladan
3. The Heir of Caladan
Collections:
The Road to Dune
Tales of Dune