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51. View of Nevada spillway during construction of Hoover Dam
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52. Hoover Dam during construction, from the Nevada side
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53. Final pour in the slot, Hoover Dam
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54. Switchyard control circuit tunnel under construction -- Hoover Dam site
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55. Construction of the Arizona power house
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56. Switchyard control house, yard and present substation -- Hoover Dam site
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57. View of lower portal during Hoover Dam construction
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58. View from the top of Hoover Dam during construction
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59. Downstream view of Hoover Dam construction
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60. Hoover Dam switchyard during construction
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61. Top of Hoover Dam during construction
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62. Hoover Dam during construction
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63. Valve house during Hoover Dam construction
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64. View of Hoover Dam construction from the top of the dam
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65. Hoover Dam under construction
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66. Switchyard at Hoover Dam during construction
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67. Hoover Dam during construction
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68. Power house during construction -- Hoover Dam
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69. View of switchyard at Hoover Dam site
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70. Hoover Dam during construction
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71. Workers in transport buses
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72. View of construction on roads around the Arizona spillway
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73. Overhead view of construction on the Arizona valve house
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74. Construction on the Nevada power house
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75. Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion...
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76. Construction on the power houses viewed from the valve house catwalk
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77. Panorama view, showing Six Companies Inc. work on the Arizona side of Black Canyon Highway.
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78. Hoover Dam construction site, looking upstream from the lower portals road
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79. Construction on the Nevada power house
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80. Construction on the Arizona power house
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81. Construction on Hoover Dam and the power houses looking upstream from the lower portals road
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82. Hoover Dam -- valve outlets in operation on the Arizona side
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83. Hoover Dam -- outlet works
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84. Hoover Dam spillway
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85. Power house -- Hoover Dam
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86. Hoover Dam construction
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87. Upstream face of Hoover Dam, looking downstream from the upstream cofferdam
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88. Cement mixing plant at Hoover Dam construction site
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89. Hoover Dam construction
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90. Hoover Dam construcion -- blasting
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91. High Scalers at Hoover Dam site
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92. High scalers -- Hoover Dam site
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93. Workers in diversion tunnels -- Hoover Dam site
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94. Construction of Hoover Dam diversion tunnel
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95. Construction of Hoover Dam
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96. Construction workers inside Hoover Dam diversion tunnel
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97. Portals, Hoover Dam construction
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98. Construction -- near Hoover Dam
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99. Black Canyon near spillway location
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100. Preliminary construction at Hoover Dam site
 

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