1. Concrete pouring forms inside lower no. 2 plug
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2. Aerial view of construction on the top of Hoover Dam
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3. Looking downstream into no. 4 raise, showing close-up of portal forms.
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4. Aerial photo of Hoover Dam construction site
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5. Construction of Hoover Dam
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6. Hoover Dam construction
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7. Hoover Dam construction
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8. Hoover Dam construction
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9. Construction of Hoover Dam
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10. Construction of Hoover Dam
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11. Night view of Hoover Dam under construction
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12. Construction of Hoover Dam
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13. Construction of the Arizona power house foundations
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14. Construction on the foundation of the Arizona power house
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15. Forms for Arizona power house retaining wall.
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16. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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17. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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18. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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19. Looking downstream over the top of Hoover Dam
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20. Intake towers and spillway -- Hoover Dam construction
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21. Nevada intake towers under construction
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22. Hoover Dam intake towers during construction
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23. View of a power house at the Hoover Dam construction site
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24. Nevada power house at Hoover Dam construction site
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25. Downsteam view of Hoover Dam, showing power house construction
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26. View of power houses being constructed at the Hoover Dam site
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27. Power house under construction at Hoover Dam site
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28. Construction on the Arizona intake towers
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29. View of Hoover Dam during construction
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30. Top of Hoover Dam, during construction
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31. Top of Hoover Dam, during construction
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32. View of the power house and valve houses from top of Hoover Dam
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33. View of bridge across Hoover Dam during construction
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34. Upstream face and intake towers of Hoover Dam during construction
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35. Hoover Dam construction, looking down on top
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36. View of valve house under construction -- Hoover Dam
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37. Intake towers during construction of Hoover Dam
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38. Hoover Dam during construction, looking downstream
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39. Hoover Dam construction -- looking into a raise
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40. Construction of the Arizona power house
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41. Central section of the powerhouse
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42. Nevada powerhouse, showing the reinforcing and walls around the penstock openings
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43. Pipe gallery of the Nevada power house
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44. Upper portal trashrack for diversion tunnel no. 1, on the Nevada side.
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45. Looking downstream into the Nevada spillway.
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46. Third millionth cubic yard of concrete being lowered to Boulder Dam
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47. View of no. 1 plug showing the arch and raise
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48. Looking upstream in Black Canyon, showing the downstream face of Boulder Dam.
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49. View showing installaion of 100-ft. drum gates in the Arizona spillway.
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50. View of the Nevada intake towers, taken from the Arizona side.
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