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A couple or three possibilities:
Time Storm by Gordon R. Dickson - Marc Despard graduates from an involuntary time traveler to a deliberate time travel, picking up many fellow travelers along the way.
Vintage Season by C L Moore - Time travellers from the future experience vintage seasons in the past.
Time's Last Gift by Philip Jose Farmer - Four scientists/anthropologists travel from 2070 A.D. to 12,000 B.C.
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