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51. View inside a tunnel at Hoover Dam site
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52. Construction on the Arizona power house
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53. Construction on the roadway on top of Hoover Dam
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54. Looking upstream toward the Nevada intake towers, showing the intake bridge girders in place.
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55. Crews and equipment in Black Canyon at dam site
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56. Digging diversion tunnels at Hoover Dam.
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57. Hoover Dam -- intake towers
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58. No. 5 intake tower finished to elevation 1232, showing curtain wall
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59. Agitators dumping concrete into buckets
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60. High scaling operations
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61. Hoover Dam site -- workers welding
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62. Upper portals -- Hoover Dam site
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63. Construction of gravel plant near Hoover Dam site
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64. Trucks hauling concrete in the diversion tunnel
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65. Close-up of formwork in the Arizona power house
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66. Construction on the Arizona power house
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67. Building of intake tower, Hoover Dam site
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68. Nevada valve house roof, looking upstream.
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69. Construction on the Arizona power house
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70. Hoover Dam workers on canyon floor
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71. Work on cofferdam -- Hoover Dam
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72. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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73. Hoover Dam, looking downstream
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74. Sidewall concreting in diversion tunnel no. 4 showing workers
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75. Concrete pouring forms and construction on the intake towers at Hoover Dam
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76. Workers and drilling jumbo inside diversion tunnel no. 4
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77. Construction worker in bulldozer in front of diversion tunnel portal
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78. Worker inside drill sharpening station
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79. Concrete lining inside diversion tunnel no. 2
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80. Construction workers at Hoover Dam
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81. High scalers preparing anchorages in Black Canyon
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82. Detail of a sidewall jumbo inside diversion tunnel no. 3
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83. Detail of side-wall jumbo inside diversion tunnel
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84. Worker operating heavy equipment at Hoover Dam site.
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85. Interior of diversion tunnel during Hoover Dam construction
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86. Construction of Hoover Dam intake towers
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87. Intake towers and spillway -- Hoover Dam construction
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88. Hoover Dam intake towers during construction
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89. Construction at Hoover Dam
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90. View of a power house at the Hoover Dam construction site
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91. Nevada power house at Hoover Dam construction site
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92. Downsteam view of Hoover Dam, showing power house construction
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93. Intake towers being constructed for Hoover Dam
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94. Interior view of a power house -- Hoover Dam construction site
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95. Power house under construction at Hoover Dam site
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96. Nevada intake towers, Hoover Dam construction site
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97. View of bridge across Hoover Dam during construction
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98. Final pour in the slot, Hoover Dam
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99. Construction at Hoover Dam, inside a tunnel
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100. Number 3 plug and raise
 

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