1. Black Canyon during dam construction
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2. Panorama view, showing Six Companies Inc. work on the Arizona side of Black Canyon Highway.
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3. Aerial photo of Hoover Dam construction site
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4. One of the construction sites in Boulder Canyon.
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5. Bridge across Boulder Canyon at Hoover Dam site.
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6. Construction of Hoover Dam
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7. Hoover Dam construction site, looking upstream
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8. Aerial view of the future site of Hoover Dam
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9. Hoover Dam construction site
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10. Construction of Hoover Dam
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11. Hoover Dam, looking downstream
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12. Hoover Dam construction, looking upstream
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13. Hoover Dam construction, looking upstream
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14. Hoover Dam construction, looking upstream
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15. Hoover Dam construction, looking upstream
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16. Hoover Dam construction, looking upstream
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17. Hoover Dam construction, looking upstream
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18. Hoover Dam construction, looking upstream
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19. Hoover Dam construction, looking upstream
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20. Hoover Dam construction, looking upstream
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21. View of Hoover Dam construction, early stage
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22. Low level concrete mixing plant seen from the Arizona side of the Colorado River
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23. Cape Horn on the Colorado River showing cliff buildings
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24. Diversion tunnels during Hoover Dam construction
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25. Blasting at Hoover Dam construction site.
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26. Construction on the upstream face of Hoover Dam
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27. Construction of the Arizona power house foundations
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28. Construction on the foundation of the Arizona power house
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29. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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30. Construction on the Nevada power house
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31. Construction on the power house footings
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32. Hoover Dam construction site viewed from the downstream cofferdam
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33. Construction on the Arizona power house
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34. Aerial view of the Hoover Dam construction site looking upstream on the Colorado River
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35. View of construction on roads around the Arizona spillway
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36. Aerial view of Hoover Dam, looking upstream on the Colorado River
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37. Hoover Dam construction site viewed from downstream
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38. Cement mixing plant at Hoover Dam construction site
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39. Hoover Dam construcion -- blasting
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40. High scalers -- Hoover Dam site
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41. High Scalers at Hoover Dam site
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42. Colorado River -- Hoover Dam site
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43. Hoover Dam construction
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44. Hoover Dam construction
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45. Colorado River, early stages of dam construction
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46. Hoover Dam construction
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47. Hoover Dam construction
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48. Hoover Dam construction
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49. Colorado River -- Hoover Dam construction site
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50. Hoover Dam construction -- various phases
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