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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. Man standing on trestle bridge on the Colorado River pointing at anchoring cables
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21. High scalers on the Nevada side of Black Canyon
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22. High scalers on the Nevada side of Black Canyon above the Colorado River
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23. Close-up of construction workers rigging a cableway over the Colorado River
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24. Construction workers on cableway transport over the Colorado River
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25. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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26. Dumping materials at temporary pile bridge to complete diversion of the Colorado River.
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27. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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28. Cut-off trench at upstream side of Hoover Dam.
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29. Concrete pouring forms below a cofferdam in the Hoover Dam construction site
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30. Trains on Elevation 720 Railroad Bench, hauling conrete to Hoover Dam.
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31. Nevada spillway during construction of Hoover Dam
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32. Himix Concrete Plant at Hoover Dam site
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33. Forms for transition at the downstream plug of Diversion Tunnel No. 2.
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34. Close-up of Hoover Dam concrete pouring construction taken from the Arizona side, looking downstream
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35. Excavation for downstream plug, Diversion Tunnel No. 2.
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36. View of two hundred ton two-way trailer, with test load
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37. Excavation for downstream plug, Diversion Tunnel No. 3.
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38. Construction on Hoover Dam, looking downstream on the Colorado River
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39. View looking into power house block A-5.
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40. Closeup of cooling pipe layout in panel H-3.
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41. Excavation for bridge abutment in Arizona spillway.
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42. Looking downstream over the top of Hoover Dam
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43. Interior of penstock tunnel -- Hoover Dam construction site
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44. Unloading huge pipes -- Hoover Dam site
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45. Nevada power house at Hoover Dam construction site
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46. Downsteam view of Hoover Dam, showing power house construction
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47. Power house under construction - Hoover Dam site
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48. Interior view of a power house -- Hoover Dam construction site
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49. View of power houses being constructed at the Hoover Dam site
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50. Power house under construction at Hoover Dam site
 

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