Date: | 03 1932 |
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Description: | Two International trucks exit a tunnel on a dirt road leading through a canyon during the construction of the Hoover Dam. Two men stand on the top of a squ... |
Date: | 04 25 1979 |
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Description: | A truck is moving along a tunnel, with a rotating scrub brush attached to its rear scrubbing the ceiling of the tunnel. A man is walking on the opposite si... |
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