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| Date: | 1931 |
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| Description: | Men drive an International truck up a dirt road along the Colorado River during the construction of the Hoover Dam in Black Canyon. There is a steam, or po... |
| Date: | |
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| Description: | Elevated view of a group of men posing standing near and on a rock face with two sets of small railroad tracks behind them. Identified as probably the quar... |
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