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251. Construction of diversion tunnels -- Hoover Dam site
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252. Himix Concrete Plant at Hoover Dam site
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253. Close-up of Hoover Dam construction
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254. Construction of Hoover Dam intake towers
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255. Forms for transition at the downstream plug of Diversion Tunnel No. 2.
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256. Nevada spillway weir section.
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257. Nevada Spillway, looking upstream.
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258. Close-up of Hoover Dam concrete pouring construction taken from the Arizona side, looking downstream
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259. Construction of the power house foundation in Hoover Dam
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260. Close-up of slot at the upstream face of Hoover Dam
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261. Construction on upstream face of Hoover Dam
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262. Construction of the bases of the Arizona intake towers
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263. Arizona intake tower derrick.
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264. Construction on the Nevada intake towers
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265. Construction on the upstream face of Hoover Dam
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266. Construction on the downstream face of Hoover Dam
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267. View taken looking upstream on the Colorado River of the Hoover Dam construction site
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268. Close-up of two-way trailer
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269. Excavation for downstream plug, Diversion Tunnel No. 2.
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270. View of two hundred ton two-way trailer, with test load
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271. Excavation for downstream plug, Diversion Tunnel No. 3.
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272. Aerial view of Hoover Dam construction site looking upstream on the Colorado River
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273. Construction on Hoover Dam, looking downstream on the Colorado River
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274. Construction on the Nevada spillway weir
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275. Construction of the Arizona power house foundations
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276. Construction on the foundation of the Arizona power house
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277. Forms for Arizona power house retaining wall.
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278. View looking into power house block A-5.
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279. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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280. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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281. Himix concrete mixing plant
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282. Concrete pouring forms inside lower no. 2 plug
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283. Closeup of cooling pipe layout in panel H-3.
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284. Excavation for bridge abutment in Arizona spillway.
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285. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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286. Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River
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287. Construction on the Nevada intake towers
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288. Construction on the Arizona intake towers and spillway
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289. Construction on the Nevada power house
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290. Construction on the Arizona power house
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291. Construction on the power house footings
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292. Looking downstream over the top of Hoover Dam
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293. Union Pacific "Train of Tomorrow" -- Hoover Dam site
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294. Nevada spillway during construction of Hoover Dam
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295. Interior of penstock tunnel -- Hoover Dam construction site
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296. Intake towers and spillway -- Hoover Dam construction
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297. Nevada intake towers under construction
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298. Hoover Dam intake towers during construction
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299. Unloading huge pipes -- Hoover Dam site
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300. Aerial photo of Hoover Dam construction site
 

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