1. Colorado River -- Hoover Dam site
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2. Colorado River, early stages of dam construction
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3. Colorado River -- Hoover Dam construction site
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4. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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5. Aerial view of the Hoover Dam construction site looking upstream on the Colorado River
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6. Aerial view of Hoover Dam, looking upstream on the Colorado River
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7. Construction -- walls of canyon
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8. Hoover Dam construction
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9. Hoover Dam during construction
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10. View of Hoover Dam construction from the top of the dam
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11. Aerial view of the future site of Hoover Dam
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12. Hoover Dam construction site
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13. Construction of Hoover Dam
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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. Looking across the river at the lower portal of Diversion Tunnel No. 3.
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22. View of Hoover Dam construction, early stage
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23. One of the construction sites in Boulder Canyon.
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24. Blasting at Hoover Dam construction site.
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25. Construction work at Hoover Dam site
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26. Hoover Dam during construction
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27. Hoover Dam under construction
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28. Hoover Dam construction
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29. Hoover Dam under construction
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30. Looking upstream toward Hoover Dam, during construction
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31. View of Hoover Dam during construction
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32. Spillway and Hoover Dam during construction
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33. Construction on the power houses and valve houses viewed from the top of Hoover Dam
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34. Hoover Dam construction
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35. Blasting -- Hoover Dam site
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36. Hoover Dam construcion -- blasting
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37. Portals, Hoover Dam construction
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38. Hoover Dam construction
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39. Hoover Dam construction
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40. Hoover Dam construction
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41. Hoover Dam construction
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42. Hoover Dam construction -- various phases
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43. Hoover Dam construction
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44. Hoover Dam construction
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45. Hoover Dam construction
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46. Hoover Dam construction
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47. Hoover Dam construction
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48. Bridge construction near Hoover Dam site
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49. Construction at lower portal of Hoover Dam
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50. Hoover Dam construction
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