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Photograph

Date:	03 1932
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...

Photograph

Date:	04 25 1979
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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