1. ZERO SUM GAMES Planet Builders #5
by Robyn Tallis 
Price: USD 3.50
Dealer: Biblio, Montclair Book Center
Description: Ivy Books, February Date: 1989. Mass Market Paperback. USED Good. 1989. Ivy Books ISBN 0804102074 9780804102070 [US] 

2. ZERO SUM GAMES Planet Builders #5
by Tallis Robyn 
Price: USD 48.88
Dealer: Biblio, Bonita
Description: mass_market. Good. Access codes and supplements are not guaranteed with used items. May be an ex-library book. ISBN 0804102074 9780804102070 [US] 

3. ZERO-SUM GAMES (Planet Builders #5)
by Robyn Tallis 
Price: USD 3.50
Dealer: Abebooks, Montclair Book Center
Description: ISBN10: 0804102074, ISBN13: 9780804102070, [publisher: Ivy Books February 1989] Softcover [Montclair, NJ, U.S.A.] [Publication Year: 1989]  

4. Zero-Sum Games (Planet Builders #5)
by Robyn Tallis 
Price: USD 3.50
Dealer: Alibris, Montclair Book Center via Alibris
Description: Ivy Books 1989 Mass Market Paperback USED Good 

5. Zero-Sum Games (Planet Builders #5)
by Tallis, Robyn 
Price: USD 41.52
Dealer: Alibris, Bonita via Alibris
Description: Ivy Books 1989 mass_market Good Access codes and supplements are not guaranteed with used items. May be an ex-library book.