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1. Trash rack structure being installed in front of diversion tunnel no. 2
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2. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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3. Workers and drilling jumbo inside diversion tunnel no. 4
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4. Close-up of workers using a drilling jumbo inside a diversion tunnel
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5. Construction worker in bulldozer in front of diversion tunnel portal
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6. Worker inside drill sharpening station
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7. Construction workers using a drilling jumbo inside a diversion tunnel
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8. Electric shovel loading rocks into dump truck
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9. Worker sitting in dump truck being loaded by power shovel
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10. Dump truck unloading debris during construction of muck disposal road
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11. Invert concrete pouring forms inside diversion tunnel
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12. Gantry crane inside diversion tunnel no. 3
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13. Concrete lining inside diversion tunnel no. 2
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14. Side-wall jumbo inside diversion tunnel
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15. Construction of steel forms for the lining of the diversion tunnels
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16. Steel form for diversion tunnel lining being hoisted into Black Canyon
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17. High scalers preparing anchorages in Black Canyon
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18. Construction workers with electric light reflectors standing by a truck in Black Canyon
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19. Section of a concrete-pouring jumbo standing outside of a diversion tunnel
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20. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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21. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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22. Cut-off trench at upstream side of Hoover Dam.
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23. Nevada spillway during construction of Hoover Dam
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24. Himix Concrete Plant at Hoover Dam site
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25. Close-up of Hoover Dam concrete pouring construction taken from the Arizona side, looking downstream
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26. Excavation for downstream plug, Diversion Tunnel No. 2.
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27. View of two hundred ton two-way trailer, with test load
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28. Excavation for downstream plug, Diversion Tunnel No. 3.
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29. Construction on Hoover Dam, looking downstream on the Colorado River
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30. View looking into power house block A-5.
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31. Closeup of cooling pipe layout in panel H-3.
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32. Excavation for bridge abutment in Arizona spillway.
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33. Looking downstream over the top of Hoover Dam
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34. Interior of penstock tunnel -- Hoover Dam construction site
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35. Unloading huge pipes -- Hoover Dam site
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36. Nevada power house at Hoover Dam construction site
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37. Downsteam view of Hoover Dam, showing power house construction
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38. Power house under construction - Hoover Dam site
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39. Interior view of a power house -- Hoover Dam construction site
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40. View of power houses being constructed at the Hoover Dam site
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41. Power house under construction at Hoover Dam site
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42. Section of penstock pipe being lifted by cable
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43. Commemoration of the pouring of the second millionth cubic yard of concrete in Hoover Dam
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44. Construction on the no. 4 penstock raise
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45. Construction on the no. 4 penstock raise
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46. Construction on the four intake towers in Hoover Dam
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47. Construction on the Nevada and Arizona power houses in the downstream cofferdam below Hoover Dam
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48. Close-up of the Nevada powerhouse, showing the draft tubes.
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49. Construction in the no. 4 penstock raise
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50. Construction in the no. 1 penstock raise
 

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