Forward the Foundation
Isaac Asimov
Foundation (7)
The Originist
Orson Scott Card
Foundation (5.5)
Trantor Falls
Harry Turtledove
Foundation (6.5)
Foundation's Conscience
George Zebrowski
Foundation (1)
Prelude to Foundation
Foundation (6)
Foundation and Earth
Foundation (5)
Foundation's Edge
Foundation (4)
The 1,000 Year Plan
Second Foundation
Foundation (3)
Foundation and Empire
Foundation (2)
The Psychohistorians
Foundation
The Foundation Trilogy (boxed set)