Search for exactly "Six Companies -- Employees", all of "Construction Workers"

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1. Hoover Dam site, looking upstream
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2. Hoover Dam site, looking downstream
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3. First concrete in Hoover Dam
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4. Hoover Dam, looking downstream
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5. Dam workers return to Boulder City after shift
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6. Bucket skips being filled with "muck" from the deep inner gorge of Black Canyon.
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7. Construction workers at Hoover Dam
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8. Workers laying railroad track near Boulder Canyon
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9. Construction scene at Hoover Dam site
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10. Nevada spillway during construction of Hoover Dam
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11. Interior of penstock tunnel -- Hoover Dam construction site
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12. Unloading huge pipes -- Hoover Dam site
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13. Interior view of a power house -- Hoover Dam construction site
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14. Commemoration of the pouring of the second millionth cubic yard of concrete in Hoover Dam
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15. Final pour in the slot, Hoover Dam
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16. Labor strike during the building of Hoover Dam
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17. Power shovel and trucks opening up an adit
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18. First 40 foot slab of concrete poured in lining diversion tunnels
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19. Day shift workers boarding transports for the return journey to Boulder City
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20. Train car dumping gravel into hopper at gravel plant
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21. Close-up of sand classifier in the gravel plant.
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22. View of the concrete lining in the diversion tunnels
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23. Agitators dumping concrete into buckets
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24. Construction worker operating a tractor during construction of Hoover Dam
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25. Temporary cableway spanning the Colorado River near Lookout Point
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26. View showing method of finishing slabs in invert lining.
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27. Trucks hauling concrete in the diversion tunnel
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28. Close-up of trimming jumbo
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29. Construction bridges across the Colorado River
 

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