Their discoveries changed our perception of prehistory.
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7 Awe-Inspiring Books about the Prehistoric Era
10 Lost Civilizations That Vanished Without a Trace
Othniel Charles Marsh (left) and Edward Drinker Cope (right).
10 Fascinating Cave Paintings That Illuminate the Prehistoric World
Brown, right, in 1911 on a barge lent to him by the American Museum of Natural History.