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251. View taken from the side -- Hoover Dam construction
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252. Looking downstream at Hoover Dam under construction
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253. View of spillway bridge under construction -- Hoover Dam
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254. View of spillway during construction of Hoover Dam
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255. Spillway and Hoover Dam during construction
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256. View of switchyard during construction of Hoover Dam
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257. Interior of tunnel during Hoover Dam construction
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258. Hoover Dam during construction
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259. Looking across the top of Hoover Dam during construction
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260. Valve house during Hoover Dam construction
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261. Interior of valve house, Hoover Dam construction
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262. View of Hoover Dam construction from the top of the dam
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263. Hoover Dam under construction
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264. Interior of diversion tunnel during Hoover Dam construction
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265. Switchyard at Hoover Dam during construction
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266. Interior of Hoover Dam diversion tunnel during construction
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267. Panorama looking downstream showing dam, spillways, intake towers and cableways
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268. Arizona spillway, looking upstream.
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269. Trash rack at the upper portals of diversion tunnnel no. 2.
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270. Boulder Dam, Hoover Dam looking upstream from the Nevada side.
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271. Looking upstream toward the upper plug and raise, in diversion tunnel no. 3.
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272. Hoover Dam during construction
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273. Power house during construction -- Hoover Dam
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274. Nevada intake towers -- Hoover Dam site
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275. Interior of diversion tunnel during Hoover Dam construction
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276. View of switchyard at Hoover Dam site
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277. Hoover Dam during construction
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278. View of power house from above -- Hoover Dam site
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279. Hoover Dam from the Arizona side
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280. Spillway during Hoover Dam construction
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281. Hoover Dam construction -- spillway
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282. View of construction on roads around the Arizona spillway
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283. Upstream view of the completed Nevada spillway drainage flume and surrounding area in Black Canyon
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284. Looking upstream from the Arizona spillway gate house towards construction on the upstream abatement wall
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285. View of Hoover Dam from the Nevada side, showing the dam, the intake towers, spillways,...
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286. Interior of the Nevada valve house
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287. Steel rails on the roof of the Nevada valve house awaiting concrete pouring
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288. Looking into the Arizona spillway raise.
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289. Arizona spillway bridge under construction
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290. Construction on the Nevada spillway
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291. Overhead view of construction on the Arizona valve house
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292. View of the Hoover Dam costruction site from the lower cofferdam
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293. Construction on the Nevada power house
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294. Construction on the Arizona power house
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295. Diversion tunnel no. 1 trashrack and counterweight assembly just prior to the diverting of the...
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296. Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion...
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297. Arizona valve house viewed from the Nevada side of Hoover Dam
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298. Construction on the Nevada valve house seen from the Arizona side of the Hoover Dam...
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299. Interior of the Nevada valve house
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300. Road tunnel portal
 

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