1. On the Shoulders of Titans: A History of Project Gemini
by Hacker, Barton C. 
Price: USD 44.57
Dealer: Abebooks, Front Cover Books
Description: ISBN10: 0160671574, ISBN13: 9780160671579, [publisher: History Division] Softcover [Denver, CO, U.S.A.] [Publication Year: 2002]  

2. On the Shoulders of Titans: A History of Project Gemini
by Hacker, Barton C. 
Price: USD 45.27
Dealer: Abebooks, Wizard Books
Description: ISBN10: 0160671574, ISBN13: 9780160671579, [publisher: History Division] Softcover New [Long Beach, CA, U.S.A.] [Publication Year: 2002]  

3. On the Shoulders of Titans: A History of Project Gemini
by Hacker, Barton C. 
Price: USD 52.02
Dealer: Abebooks, GoldBooks
Description: ISBN10: 0160671574, ISBN13: 9780160671579, [publisher: History Division] Softcover New Copy. Customer Service Guaranteed [Denver, CO, U.S.A.] [Publication Year: 2002]