Threshold by Ryk E. Spoor, Eric Flint

456 pages paperback 2010

4 editions

fiction science fiction adventurous fast-paced
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When the strange fossil she'd discovered had ended up giving her a trip to Mars, Helen Sutter thought she'd gone about as far as any paleontologist would ever go in her lifetime. But when you've also married A.J. Baker, overconfident super- sensor...

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