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