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In 1956, Congress passed legislation that provided authorization and funds for emergency research to be conducted in Glen Canyon in response to the threat of losses posted by the construction of the Glen Canyon Dam in northern Arizona. For eight years, scientists worked against the clock to record the archaeology, geology, history, and paleontology of the region before the waters of Lake Powell covered the area.

In this highly interpretive summary, Jesse Jennings preserves the achievements of the salvage team and explains how the finds affected previous conclusions. Maps and...