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1. Night view of Hoover Dam under construction
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2. Crane transporting mixers in diversion tunnel at Hoover Dam site
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3. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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4. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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5. Night view of the gravel plant
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6. Invert concrete pouring forms inside diversion tunnel
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7. Gantry crane inside diversion tunnel no. 3
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8. Invert forms inside diversion tunnel no. 3
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9. Concrete lining inside diversion tunnel no. 3
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10. Concrete lining inside diversion tunnel no. 2
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11. Concrete side wall lining in diversion tunnel no. 3
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12. Side-wall jumbo inside diversion tunnel
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13. Construction workers with electric light reflectors standing by a truck in Black Canyon
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14. Diversion tunnel at Hoover Dam
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15. Forms for transition at the downstream plug of Diversion Tunnel No. 2.
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16. Excavation for downstream plug, Diversion Tunnel No. 2.
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17. Excavation for downstream plug, Diversion Tunnel No. 3.
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18. Concrete pouring forms inside lower no. 2 plug
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19. Inside machinery room at Hoover Dam site
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20. Night photograph of power house construction.
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21. Night photo of Hoover Dam, during construction
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22. Construction at Hoover Dam, inside a tunnel
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23. View of no. 4 plug, Hoover Dam site
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24. Interior of power house gallery, Hoover Dam site
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25. Interior of power house gallery, Hoover Dam site
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26. Interior of diversion tunnel showing pipe
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27. Interior of diversion tunnel during Hoover Dam construction
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28. Outlet works -- Hoover Dam -- night view
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29. Construction -- Hoover Dam outlet works
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30. Night construction -- intake tower at Hoover Dam
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31. Hoover Dam -- at night
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32. Outlet works -- Hoover Dam
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33. Night view of the diversion tunnels
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34. Night view of outlet works at Hoover Dam during construction
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35. Hoover Dam -- at night
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36. Hoover Dam -- at night
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37. Top of Hoover Dam at night
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38. Hoover Dam at night
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39. Hoover Dam -- at night
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40. Hoover Dam at night from downstream side
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41. Night construction, Hoover Dam
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42. Spillway construction, Hoover Dam, at night
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43. Night view of Hoover Dam
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44. Hoover Dam at night
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45. Night view of Hoover Dam
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46. Workers in diversion tunnels -- Hoover Dam site
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47. Construction workers in diversion tunnel, Hoover Dam site
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48. Diversion tunnel under construction at Hoover Dam site
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49. Aerial view of sundown in Black Canyon at the Hoover Dam construction site
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50. Sundown in Black Canyon at the Hoover Dam construction site
 

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