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201. Construction of Hoover Dam intake towers
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202. Construction of Hoover Dam intake towers
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203. Construction on the Nevada power house
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204. Construction on the Arizona power house
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205. Inside machinery room at Hoover Dam site
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206. Construction on the Nevada power house
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207. Aerial view of the Hoover Dam construction site looking upstream on the Colorado River
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208. Looking downstream on the Hoover Dam construction site
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209. View of the power house and valve houses from top of Hoover Dam
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210. View of Arizona spillway during construction
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211. Hoover Dam, looking downstream
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212. Hoover Dam under construction
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213. Central section of the powerhouse
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214. Nevada powerhouse, showing the reinforcing and walls around the penstock openings
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215. Pipe gallery of the Nevada power house
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216. Upper portal trashrack for diversion tunnel no. 1, on the Nevada side.
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217. Looking upstream in Black Canyon, showing the downstream face of Boulder Dam.
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218. View of lower portal during Hoover Dam construction
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219. Construction view of the valve house and portal area of Hoover Dam
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220. Looking upstream at Hoover Dam during construction
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221. View from the top of Hoover Dam during construction
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222. Nevada intake towers, from the Arizona side.
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223. Downstream view of Hoover Dam construction
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224. View taken from the side -- Hoover Dam construction
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225. Looking downstream at Hoover Dam under construction
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226. View of spillway during construction of Hoover Dam
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227. Valve house during Hoover Dam construction
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228. Boulder Dam, Hoover Dam looking upstream from the Nevada side.
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229. View of power house from above -- Hoover Dam site
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230. Workers in transport buses
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231. Sedimentation tank for Six Companies gravel plant.
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232. Construction crew at bottom of Boulder Canyon
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233. Boulder pack train, tourist concession on the Colorado River near Black Canyon
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234. Hoover Dam -- valve outlet on the Arizona side
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235. Hoover Dam -- valve outlet in operation on the Arizona side
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236. Hoover dam -- water flowing from valve outlets
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237. Hoover Dam -- looking downstream showing the valve outlets
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238. Hoover Dam -- valve outlets in operation on the Arizona side
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239. Hoover dam -- valve outlets in operation on the Arizona side
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240. Interior of Six companies, Inc. machine shop
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241. Hoover Dam -- valve outlets in operation on the Nevada side
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242. Close-up of sand classifier in the gravel plant.
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243. Sand classifer in gravel plant producing sand for storage
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244. Arizona valve house from the center of the low cat walk
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245. Telephoto view of Arizona powerhouse units
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246. Concrete mixing plant in Black Canyon
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247. Aerial view of the Hoover Dam area
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248. Portals, Hoover Dam construction
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249. Construction -- near Hoover Dam
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250. Upper portals -- Hoover Dam site
 

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