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201. Valve house under construction -- Hoover Dam
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202. Intake towers during construction of Hoover Dam
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203. Hoover Dam during construction, looking downstream
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204. Hoover Dam construction -- looking into a raise
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205. Construction at Hoover Dam, inside a tunnel
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206. Construction of the Arizona power house
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207. Central section of the powerhouse
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208. Nevada powerhouse, showing the reinforcing and walls around the penstock openings
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209. Pipe gallery of the Nevada power house
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210. Upper portal trashrack for diversion tunnel no. 1, on the Nevada side.
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211. Diversion tunnel no. 2, showing the pumpcrete line to the upstream plug
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212. Looking downstream into no. 4 raise, showing close-up of portal forms.
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213. Looking downstream into the Nevada spillway.
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214. Hoover Dam, looking upstream from Lookout Point
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215. Third millionth cubic yard of concrete being lowered to Boulder Dam
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216. Looking upstream through penstock tunnel no. 5
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217. View of no. 1 plug showing the arch and raise
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218. Number 3 plug and raise
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219. Looking upstream in Black Canyon, showing the downstream face of Boulder Dam.
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220. View showing installaion of 100-ft. drum gates in the Arizona spillway.
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221. View of the Nevada intake towers, taken from the Arizona side.
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222. Arizona intake towers and spillway
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223. Hoover Dam valve house under construction
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224. Hoover Dam valve house under construction
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225. Hoover Dam power house under construction
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226. View of no. 4 plug, Hoover Dam site
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227. Interior of power house gallery, Hoover Dam site
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228. Interior of power house turbine gallery, Hoover Dam site
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229. Interior of power house gallery, Hoover Dam site
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230. Interior of power house gallery, Hoover Dam site
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231. Interior of valve house during Hoover Dam construction
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232. Nevada valve house roof, looking upstream.
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233. Switchyard control house, yard and present substation -- Hoover Dam site
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234. View of lower portal during Hoover Dam construction
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235. Cleanup site at lower portal of Hoover Dam
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236. Construction view of the valve house and portal area of Hoover Dam
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237. View inside a tunnel at Hoover Dam site
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238. Looking upstream at Hoover Dam during construction
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239. View from the top of Hoover Dam during construction
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240. Arizona intake towers, from the Nevada side
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241. Nevada intake towers, from the Arizona side.
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242. Downstream view of Hoover Dam construction
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243. Panoramic view of Hoover Dam and area during construction
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244. View from the reservoir, looking downstream at Hoover Dam
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245. Hoover Dam switchyard during construction
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246. Top of Hoover Dam during construction
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247. Construction inside tunnel, Hoover Dam site
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248. Interior of diversion tunnel showing pipe
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249. Hoover Dam during construction
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250. Top of Hoover Dam during construction
 

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