Foundation series

• Prelude to Foundation (prequel)
• Forward the Foundation (prequel)

1. Foundation
2. Foundation and Empire
3. Second Foundation
4. Foundation's Edge
5. Foundation and Earth

Second Foundation

1. Foundation's Fear - by Gregory Benford (do not own)
2. Foundation and Chaos - by Greg Bear (do not own)
3. Foundation's Triumph - by David Brin (do not own)