Foundation Universe

Robot

• The Caves of Steel (1954) [3421]
• The Naked Sun (1957) [3422]
• The Robots of Dawn (1983) [3424]
• Robots and Empire (1985) [3624]

Empire

• The Stars, Like Dust (1951) [4850]
• The Currents of Space (1952) [11129]
• Pebble in the Sky (1950) [12411]

Foundation

• Prelude to Foundation (1988) [23604]
• Forward the Foundation (1993 [23612—23653]
• Foundation (1951) [23651—23812]
• Foundation and Empire (1952) [23847—23963]
• Second Foundation (1953) [23968—24029]
• Foundation’s Edge (1982) [24150]
• Foundation and Earth (1986) [24150]