Time's Last Gift

Ballantine Del Rey, 1977. FIRST REVISED AND EXPANDED EDITION of this 1972 novel. "Three men and a woman onboard a timeship travel from 2070 AD to 12,000 BC - a journey that could never be repeated. For the passengers, all anthropologists, it was a once-in-a-million-lifetimes expedition... a chance to study primitive man as modern man never could. But none of them was prepared for what they would discover - or for the impact of their travels in a time that had yet to come..."