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151. Aerial view of construction on the top of Hoover Dam
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152. Construction workers on the drum gates in the Arizona spillway
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153. Construction on the Nevada spillway
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154. Aerial view of the Hoover Dam construction site viewed from downstream on the Colorado River
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155. Construction on the no. 4 penstock raise
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156. Construction on the Arizona spillway
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157. Construction on the no. 4 penstock raise
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158. Construction on the four intake towers in Hoover Dam
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159. Construction on the Nevada and Arizona power houses in the downstream cofferdam below Hoover Dam
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160. Close-up of the Nevada powerhouse, showing the draft tubes.
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161. Construction on the Nevada power house viewed from the Arizona valve bench
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162. Construction on the Arizona power house viewed from the Nevada valve house bench
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163. Construction on the Arizona spillway and the no. 4 penstock raise in Black Canyon
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164. Aerial view of the Hoover Dam construction site in Black Canyon showing the upstream dam...
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165. Construction in the no. 4 penstock raise
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166. Construction inside the upper no. 3 plug
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167. Aerial view of the Hoover Dam construction site looking upstream on the Colorado River
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168. Construction in the no. 1 penstock raise
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169. Construction on the Arizona intake towers
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170. Construction on the Nevada intake towers
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171. Close-up of formwork in the Arizona power house
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172. Night photograph of power house construction.
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173. Construction on the Nevada power house
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174. Construction on the Arizona power house
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175. Looking upstream toward Hoover Dam, during construction
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176. Night photo of Hoover Dam, during construction
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177. Looking downstream on the Hoover Dam construction site
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178. Upstream face of Hoover Dam, during construction
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179. View of Hoover Dam during construction
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180. Top of Hoover Dam, during construction
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181. Top of Hoover Dam, during construction
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182. Nevada intake towers, Hoover Dam construction site
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183. Construction view of Hoover Dam, looking downstream
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184. Hoover Dam during construction
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185. View of the power house and valve houses from top of Hoover Dam
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186. View of bridge across Hoover Dam during construction
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187. Upstream face and intake towers of Hoover Dam during construction
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188. View of a spillway bridge during construction of Hoover Dam
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189. View of Arizona spillway during construction
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190. View of Nevada spillway during construction of Hoover Dam
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191. Memorial Day exercises at Hoover Dam
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192. Hoover Dam during construction, from the Nevada side
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193. Final pour in the slot, Hoover Dam
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194. Building of intake tower, Hoover Dam site
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195. Hoover Dam, looking downstream
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196. Hoover Dam under construction
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197. Arizona Black Canyon highway consruction
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198. Switchyard control circuit tunnel under construction -- Hoover Dam site
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199. Hoover Dam construction, looking down on top
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200. View of valve house under construction -- Hoover Dam
 

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