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101. Close-up of Arizona intake towers
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102. Spillway on Arizona side of Hoover Dam
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103. Colorado River near Black Canyon
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104. Lower portals of Diversion Tunnels No. 3 and No. 4, during the flood.
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105. Looking across the river at the lower portal of Diversion Tunnel No. 3.
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106. Gas-air shovel caught in the flooded Colorado River
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107. Partially washed-out truck bridge across from diversion tunnels
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108. Portion of the gravel pits on the Arizona side of the Colorado River
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109. Dragline loading gravel
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110. Dragline loading gravel into side-dump car
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111. Train loaded with gravel leaving the gravel pits
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112. Trash rack structure being installed in front of diversion tunnel no. 2
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113. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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114. Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the...
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115. Workers and drilling jumbo inside diversion tunnel no. 4
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116. Close-up of workers using a drilling jumbo inside a diversion tunnel
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117. First-aid station and ambulance
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118. Construction worker in bulldozer in front of diversion tunnel portal
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119. Worker inside drill sharpening station
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120. Construction of the highway which will cross the top of the dam
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121. Looking downstream on the Colorado River running through Black Canyon prior to construction of Hoover...
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122. Construction workers using a drilling jumbo inside a diversion tunnel
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123. Aerial view of Colorado River-Black Canyon
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124. View of Hoover Dam construction, early stage
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125. Power substation during Hoover Dam construction
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126. Aerial view of Black Canyon and the Colorado River
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127. Aerial view of Black Canyon and the Colorado River
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128. People at Lookout Point viewing Hoover Dam construction
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129. Screened aggregate and sand in front of the gravel plant
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130. Night view of the gravel plant
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131. Man on bank of Colorado River
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132. Men working on bank of Colorado River
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133. Colorado River in Black Canyon
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134. Colorado River in Black Canyon at sunrise
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135. Colorado River in Black Canyon
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136. Man on bank of Colorado River in Black Canyon
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137. Surveyors overlooking Black Canyon.
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138. General view -- Boulder City.
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139. Colorado River below Hoover Dam site
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140. Boulder City, Nevada
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141. Electric shovel loading rocks into dump truck
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142. Worker sitting in dump truck being loaded by power shovel
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143. Dump truck unloading debris during construction of muck disposal road
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144. Invert concrete pouring forms inside diversion tunnel
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145. Gantry crane inside diversion tunnel no. 3
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146. Invert forms inside diversion tunnel no. 3
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147. Blasting in the walls of Black Canyon for intake tower construction
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148. Blasting in Black Canyon seen from the Colorado River
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149. Low level concrete mixing plant seen from the Arizona side of the Colorado River
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150. Concrete lining inside diversion tunnel no. 3
 

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