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1. Workers in transport buses
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2. Visitors at Lookout Point
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3. Night view of the diversion tunnels
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4. Downstream view of Hoover Dam construction site
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5. Interior of low-level concrete mixing plant
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6. View of mixing plant
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7. Machine shop and warehouse group of buildings
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8. Interior of Six companies, Inc. machine shop
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9. Upstream view of Black Canyon during early stage of Hoover Dam construction
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10. Power shovel and trucks opening up an adit
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11. First 40 foot slab of concrete poured in lining diversion tunnels
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12. Day shift workers boarding transports for the return journey to Boulder City
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13. Train car dumping gravel into hopper at gravel plant
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14. Close-up of sand classifier in the gravel plant.
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15. Water clarifier tank at the gravel plant
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16. Sand classifer in gravel plant producing sand for storage
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17. View of the concrete lining in the diversion tunnels
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18. Agitators dumping concrete into buckets
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19. Blast scales down the canyon walls for the construction of the intake towers
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20. Nevada Spillway open cut excavation
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21. Concrete mixing plant in Black Canyon
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22. Construction worker operating a tractor during construction of Hoover Dam
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23. Temporary cableway spanning the Colorado River near Lookout Point
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24. View showing method of finishing slabs in invert lining.
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25. Trucks hauling concrete in the diversion tunnel
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26. Close-up of trimming jumbo
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27. Construction bridges across the Colorado River
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28. Hoover Dam construction site, looking upstream
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29. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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30. Hoover Dam site, looking upstream
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31. Crane transporting mixers in diversion tunnel at Hoover Dam site
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32. Hoover Dam site, looking downstream
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33. First concrete in Hoover Dam
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34. Hoover Dam, looking upstream
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35. Hoover Dam, looking downstream
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36. Hoover Dam construction, looking upstream
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37. Hoover Dam construction, looking upstream
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38. Hoover Dam construction, looking upstream
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39. Hoover Dam construction, looking upstream
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40. Hoover Dam construction, looking upstream
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41. Hoover Dam construction, looking upstream
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42. Hoover Dam construction, looking upstream
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43. Hoover Dam construction, looking upstream
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44. Hoover Dam construction, looking upstream
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45. Hoover Dam under construction
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46. Power house on Nevada side of Hoover Dam
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47. Close-up of Arizona intake towers
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48. Spillway on Arizona side of Hoover Dam
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49. Colorado River question : shall natural resources create local or enlarge distant development?
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50. Boulder Canyon dam : the essence of the Swing-Johnson Bill ; Boulder Dam : from...
 

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