In a near future paleo geological expedition, Gordon Redcliff was the project's main security asset: a sniper. He was also a savant at learning languages which is why he was picked to replace an injured member to go back in time to the last ice age with the warning to change nothing, not even a grain of sand, that might alter the future. And then something went wrong . . .
Genre: Science Fiction
Genre: Science Fiction
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Used availability for Barry B Longyear's Turning The Grain