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51. Section of penstock pipe being lifted by cable
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52. Commemoration of the pouring of the second millionth cubic yard of concrete in Hoover Dam
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53. Construction workers on the drum gates in the Arizona spillway
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54. Construction on the no. 4 penstock raise
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55. Construction on the no. 4 penstock raise
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56. Construction on the four intake towers in Hoover Dam
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57. Construction on the Nevada and Arizona power houses in the downstream cofferdam below Hoover Dam
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58. Close-up of the Nevada powerhouse, showing the draft tubes.
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59. Construction in the no. 4 penstock raise
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60. Construction in the no. 1 penstock raise
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61. Close-up of formwork in the Arizona power house
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62. Construction on the Arizona power house
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63. Looking downstream on the Hoover Dam construction site
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64. Top of Hoover Dam, during construction
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65. Top of Hoover Dam, during construction
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66. View of bridge across Hoover Dam during construction
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67. View of Arizona spillway during construction
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68. Final pour in the slot, Hoover Dam
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69. Building of intake tower, Hoover Dam site
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70. Switchyard control circuit tunnel under construction -- Hoover Dam site
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71. Hoover Dam construction, looking down on top
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72. Intake towers during construction of Hoover Dam
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73. Construction at Hoover Dam, inside a tunnel
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74. Construction of the Arizona power house
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75. Central section of the powerhouse
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76. Diversion tunnel no. 2, showing the pumpcrete line to the upstream plug
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77. View of no. 1 plug showing the arch and raise
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78. Nevada valve house roof, looking upstream.
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79. Switchyard control house, yard and present substation -- Hoover Dam site
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80. Cleanup site at lower portal of Hoover Dam
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81. View inside a tunnel at Hoover Dam site
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82. Looking upstream at Hoover Dam during construction
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83. Top of Hoover Dam during construction
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84. Interior of Hoover Dam diversion tunnel during construction
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85. View of switchyard at Hoover Dam site
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86. View of construction on roads around the Arizona spillway
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87. Interior of the Nevada valve house
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88. Steel rails on the roof of the Nevada valve house awaiting concrete pouring
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89. Construction on the Nevada spillway
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90. Construction on the Arizona power house
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91. Diversion tunnel no. 1 trashrack and counterweight assembly just prior to the diverting of the...
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92. Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion...
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93. Interior of the Nevada valve house
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94. Construction on the power houses viewed from the valve house catwalk
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95. Panorama view, showing Six Companies Inc. work on the Arizona side of Black Canyon Highway.
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96. Construction on the roadway on top of Hoover Dam
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97. Looking upstream toward the Nevada intake towers, showing the intake bridge girders in place.
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98. Construction on the Arizona power house
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99. No. 5 intake tower finished to elevation 1232, showing curtain wall
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100. Looking upstream at the upper end of no. 1 plug, showing forms for the intake...
 

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