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201. Aerial view of the upper cofferdam on the Colorado River in Black Canyon
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202. Concrete pouring forms in the Hoover Dam construction site in Black Canyon
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203. Cut-off trench at upstream side of Hoover Dam.
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204. Concrete pouring forms below a cofferdam in the Hoover Dam construction site
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205. Nevada Spillway, looking upstream.
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206. Water flowing into Colorado River, June 16, 1933
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207. Arizona Spillway, looking upstream.
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208. Hoist House and Nevada Anchorage, Government Cableway.
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209. Trains on Elevation 720 Railroad Bench, hauling conrete to Hoover Dam.
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210. Aerial view of concrete pouring in the Hoover Dam construction site
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211. Concrete pouring forms in the Hoover Dam construction site
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212. Looking upstream at the Arizona Spillway.
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213. Looking upstream at the Nevada Spillway.
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214. Government cableway and hoisting house
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215. Concrete plant
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216. Hoover Dam cooling tower and refrigeration plant during construction
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217. Nevada spillway during construction of Hoover Dam
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218. Hoover Dam construction
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219. Hoover Dam during construction
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220. Hoover Dam construction -- cooling tower and refrigeration plant
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221. Arizona spillway during construction of Hoover Dam
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222. Nevada spillway during construction of Hoover Dam
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223. Interior of spillway tunnel, Hoover Dam site
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224. Hoover Dam during construction
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225. Diversion tunnel at Hoover Dam
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226. Men working on Hoover Dam.
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227. Men operating heavy equipment at Hoover Dam site.
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228. Boulder Canyon.
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229. Boulder Canyon.
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230. Close-up of man working on construction of Hoover Dam.
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231. Construction workers at Hoover Dam site.
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232. Blast at Hoover Dam site.
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233. Worker operating heavy equipment at Hoover Dam site.
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234. Boulder Canyon.
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235. Construction worker at Hoover Dam.
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236. Construction workers on cliffs in Boulder Canyon.
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237. Aerial view of Colorado River in Boulder Canyon.
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238. Aerial view of Boulder Canyon.
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239. Boulder Canyon floor after water from river had been diverted.
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240. Floor of Black Canyon
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241. Construction workers at bottom of Boulder Canyon
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242. Black Canyon
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243. Hoover Dam under construction
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244. Interior of diversion tunnel during Hoover Dam construction
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245. Hoover Dam during construction
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246. Spillway weir under construction -- Hoover Dam site
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247. Construction of intake towers and spillway -- Hoover Dam site
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248. Construction of Hoover Dam intake towers
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249. Hoover Dam construction
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250. Hoover Dam under construction
 

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