A uniformed guide explains an earthquake detector (lower right) to a tour group in an inspection tunnel at Hoover Dam

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A uniformed guide explains an earthquake detector (lower right) to a tour group in an inspection tunnel at Hoover Dam on the Colorado River.

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Size: 3400px × 5100px
Location: Hoover Dam nevada usa
Photo credit: © Spencer Grant / Art Directors / Alamy / Afripics
License: Licensed
Model Released: No

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