1. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 17.98
Dealer: Alibris, ThriftBooks-Reno via Alibris
Description: Space Studies Institute Press 1989 Softcover Good Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less. 

2. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 17.98
Dealer: Alibris, ThriftBooks-Reno via Alibris
Description: Space Studies Institute Press 1989 Softcover Good Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less. 

3. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 17.98
Dealer: Alibris, ThriftBooks-Dallas via Alibris
Description: Space Studies Institute Press 1989 Softcover Good Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less. 

4. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 17.98
Dealer: Alibris, ThriftBooks-Dallas via Alibris
Description: Space Studies Institute Press 1989 Softcover Good Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less. 

5. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 17.98
Dealer: Alibris, ThriftBooks-Baltimore via Alibris
Description: Space Studies Institute Press 1989 Softcover Good Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less. 

6. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 18.99
Dealer: Alibris, Wonder Book - Member ABAA/ILAB via Alibris
Description: Space Studies Institute Press 1989 Trade paperback Very Good Very Good condition. A copy that may have a few cosmetic defects. May also contain light spine creasing or a few markings such as an owner's name, short gifter's inscription or light stamp. 

7. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 19.67
Dealer: ZVAB, Wonder Book
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover Very Good condition. A copy that may have a few cosmetic defects. May also contain light spine creasing or a few markings such as an owner's name, short gifter's inscription or light stamp. [Frederick, MD, U.S.A.] [Publication Year: 1989]  

8. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 20.49
Dealer: Abebooks, Wonder Book
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover Very Good condition. A copy that may have a few cosmetic defects. May also contain light spine creasing or a few markings such as an owner's name, short gifter's inscription or light stamp. [Frederick, MD, U.S.A.] [Publication Year: 1989]  

9. The High Frontier: Human Colonies in Space
by O'Neil Gerard 
Price: USD 21.98
Dealer: Biblio, ThriftBooks
Description: Space Studies Institute Press, Date: 1989. Paperback. Good. Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.Dust jacket quality is not guaranteed. 1989. Space Studies Institute Press ISBN 0962237906 9780962237904 [US] 

10. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 21.98
Dealer: Abebooks, ThriftBooks-Dallas
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Institute Press] Softcover Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less 0.95 [Dallas, TX, U.S.A.] [Publication Year: 1989]  

11. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 21.98
Dealer: Abebooks, ThriftBooks-Atlanta
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Institute Press] Softcover Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less 0.95 [AUSTELL, GA, U.S.A.] [Publication Year: 1989]  

12. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 21.98
Dealer: Abebooks, ThriftBooks-Phoenix
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Institute Press] Softcover Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less 0.95 [Phoenix, AZ, U.S.A.] [Publication Year: 1989]  

13. The High Frontier: Human Colonies in Space
by O'Neil, Gerard 
Price: USD 21.98
Dealer: Abebooks, ThriftBooks-Reno
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Institute Press] Softcover Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less 0.95 [Reno, NV, U.S.A.] [Publication Year: 1989]  

14. High Frontier: Human Colonies in Space
by Gerard O'Neill 
Price: USD 28.57
Dealer: Biblio, Ergodebooks
Description: Space Studies Inst Pr, Date: 1989-05. Paperback. Good. 1989. Space Studies Inst Pr ISBN 0962237906 9780962237904 [US] 

15. High Frontier: Human Colonies in Space
by O'Neill Gerard 
Price: USD 36.60
Dealer: Biblio, Wonder Book
Description: Space Studies Inst Pr. Used - Very Good. Very Good condition. A copy that may have a few cosmetic defects. May also contain light spine creasing or a few markings such as an owner’s name, short gifter’s inscription or light stamp. Space Studies Inst Pr ISBN 0962237906 9780962237904 [US] 

16. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 86.72
Dealer: Abebooks, Book Deals
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover Good condition. This is the average used book, that has all pages or leaves present, but may include writing. Book may be ex-library with stamps and stickers. [Tucson, AZ, U.S.A.] [Publication Year: 1989]  

17. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 102.43
Dealer: Abebooks, GoldenWavesOfBooks
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover New. Fast Shipping and good customer service [Fayetteville, TX, U.S.A.] [Publication Year: 1989]  

18. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 113.14
Dealer: Abebooks, GoldBooks
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover New Copy. Customer Service Guaranteed [Denver, CO, U.S.A.] [Publication Year: 1989]  

19. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 113.60
Dealer: Abebooks, Front Cover Books
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Brand: Space Studies Inst Pr] Softcover [Denver, CO, U.S.A.] [Publication Year: 1989]  

20. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 114.11
Dealer: Alibris, GridFreed via Alibris
Description: Space Studies Inst Pr 1989-05-01 Paperback New Size: 7x4x0; New. In shrink wrap. Looks like an interesting title! 

21. HIGH FRONTIER: HUMAN COLONIES IN
by O'Neill, Gerard 
Price: USD 114.11
Dealer: Abebooks, BennettBooksLtd
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover New. In shrink wrap. Looks like an interesting title! 0.95 [North Las Vegas, NV, U.S.A.] [Publication Year: 1989]  

22. High Frontier: Human Colonies in Space
by O'Neill, Gerard 
Price: USD 114.40
Dealer: Abebooks, Wizard Books
Description: ISBN10: 0962237906, ISBN13: 9780962237904, [publisher: Space Studies Inst Pr] Softcover New [Long Beach, CA, U.S.A.] [Publication Year: 1989]  

23. High Frontier: Human Colonies in Space
by O'Neill Gerard 
Price: USD 119.82
Dealer: Biblio, GridFreed LLC
Description: Space Studies Inst Pr, Date: 1989-05-01. Paperback. New. New. In shrink wrap. Looks like an interesting title! 1989. Space Studies Inst Pr ISBN 0962237906 9780962237904 [US]