201. View of a spillway bridge during construction of Hoover Dam
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202. View of Arizona spillway during construction
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203. View of Nevada spillway during construction of Hoover Dam
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204. Final pour in the slot, Hoover Dam
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205. Building of intake tower, Hoover Dam site
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206. Hoover Dam under construction
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207. Arizona Black Canyon highway consruction
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208. Switchyard control circuit tunnel under construction -- Hoover Dam site
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209. Hoover Dam construction, looking down on top
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210. View of valve house under construction -- Hoover Dam
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211. Valve house under construction -- Hoover Dam
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212. Intake towers during construction of Hoover Dam
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213. Hoover Dam during construction, looking downstream
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214. Hoover Dam construction -- looking into a raise
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215. Construction at Hoover Dam, inside a tunnel
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216. View of no. 1 plug showing the arch and raise
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217. Number 3 plug and raise
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218. Hoover Dam valve house under construction
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219. Hoover Dam valve house under construction
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220. Hoover Dam power house under construction
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221. View of no. 4 plug, Hoover Dam site
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222. Nevada valve house roof, looking upstream.
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223. Switchyard control house, yard and present substation -- Hoover Dam site
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224. View of lower portal during Hoover Dam construction
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225. Construction view of the valve house and portal area of Hoover Dam
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226. View inside a tunnel at Hoover Dam site
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227. Looking upstream at Hoover Dam during construction
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228. View from the top of Hoover Dam during construction
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229. Arizona intake towers, from the Nevada side
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230. Nevada intake towers, from the Arizona side.
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231. Hoover Dam switchyard during construction
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232. Top of Hoover Dam during construction
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233. Hoover Dam during construction
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234. Top of Hoover Dam during construction
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235. Blasting and construction on Hoover Dam
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236. View taken from the side -- Hoover Dam construction
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237. Looking downstream at Hoover Dam under construction
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238. View of spillway bridge under construction -- Hoover Dam
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239. View of spillway during construction of Hoover Dam
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240. Spillway and Hoover Dam during construction
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241. View of switchyard during construction of Hoover Dam
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242. Hoover Dam during construction
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243. Valve house during Hoover Dam construction
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244. Hoover Dam under construction
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245. Interior of Hoover Dam diversion tunnel during construction
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246. Arizona spillway, looking upstream.
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247. Hoover Dam during construction
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248. Power house during construction -- Hoover Dam
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249. View of switchyard at Hoover Dam site
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250. Hoover Dam from the Arizona side
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