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201. Hoover Dam during construction
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202. Hoover Dam under construction
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203. Construction of diversion tunnels -- Hoover Dam site
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204. Close-up of Hoover Dam construction
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205. Nevada spillway weir section.
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206. Close-up of slot at the upstream face of Hoover Dam
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207. Construction on upstream face of Hoover Dam
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208. Construction of the bases of the Arizona intake towers
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209. Arizona intake tower derrick.
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210. Construction on the Nevada intake towers
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211. Construction on the upstream face of Hoover Dam
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212. Construction on the downstream face of Hoover Dam
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213. View taken looking upstream on the Colorado River of the Hoover Dam construction site
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214. Close-up of two-way trailer
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215. Construction on the Nevada spillway weir
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216. Construction of the Arizona power house foundations
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217. Construction on the foundation of the Arizona power house
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218. Forms for Arizona power house retaining wall.
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219. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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220. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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221. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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222. Construction on the Nevada intake towers
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223. Construction on the Arizona intake towers and spillway
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224. Construction on the Nevada power house
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225. Construction on the power house footings
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226. Nevada spillway during construction of Hoover Dam
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227. Unloading huge pipes -- Hoover Dam site
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228. Aerial photo of Hoover Dam construction site
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229. Train at Himix Concrete Plant -- Hoover Dam site
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230. Nevada intake towers under construction at Hoover Dam
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231. Aerial view of the Hoover Dam construction site looking upstream on the Colorado River
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232. Aerial view of the Hoover Dam construction site looking downstream from the Arizona side
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233. Close-up of no. 3 Arizona intake tower, showing the cylinder gates being placed.
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234. Close-up of the Arizona intake towers, from the high catwalk.
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235. Hoover Dam construction site viewed from the downstream cofferdam
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236. Construction on the Nevada power house
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237. Construction on the Nevada power house in the downstream cofferdam
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238. Construction on the Arizona power house
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239. Construction on the Nevada spillway
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240. Commemoration of the pouring of the second millionth cubic yard of concrete in Hoover Dam
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241. Aerial view of construction on the top of Hoover Dam
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242. Construction on the Nevada spillway
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243. Aerial view of the Hoover Dam construction site viewed from downstream on the Colorado River
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244. Construction on the Arizona spillway
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245. Construction on the no. 4 penstock raise
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246. Construction on the Nevada and Arizona power houses in the downstream cofferdam below Hoover Dam
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247. Close-up of the Nevada powerhouse, showing the draft tubes.
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248. Construction on the Nevada power house viewed from the Arizona valve bench
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249. Construction on the Arizona power house viewed from the Nevada valve house bench
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250. Construction on the Arizona spillway and the no. 4 penstock raise in Black Canyon
 

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