Double cross [electronic resource]
Sigmund Brouwer.
- Carol Stream, Ill. : Tyndale House Publishers, 2009.
- 1 online resource (253 p.)
- Robot wars ; 2 .
This edition combines the contents of Mars diaries, Mission 3, Time bomb and Mars diaries, Mission 4, Hammerhead under title Double cross. Previously published in 2 vols.