Acheulean hand axes
U.S. Army Corps of Engineers Archaeologists Amy Williams displays one of the Acheulean hand axes found in the Nigerien desert that can be dated to more than 1 million years ago. Three hand axes were discovered during a cultural survey of an international air base under construction.

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Photo by: U.S. Army Corps of Engineers St. Louis District |  VIRIN: 170305-A-CE999-009.JPG