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351. Screened aggregate and sand in front of the gravel plant
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352. Night view of the gravel plant
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353. Diversion tunnels during Hoover Dam construction
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354. Construction crews in Boulder Canyon.
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355. Hoover Dam cooling tower and refrigeration plant during construction
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356. Hoover Dam during construction
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357. Boulder Canyon floor after water from river had been diverted.
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358. Construction of intake towers and spillway -- Hoover Dam site
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359. Construction of the power house foundation in Hoover Dam
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360. Construction on the Arizona power house
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361. Union Pacific "Train of Tomorrow" -- Hoover Dam site
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362. Bridge across Boulder Canyon at Hoover Dam site.
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363. Workers on the Colorado River
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364. View of power houses being constructed at the Hoover Dam site
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365. Aerial view of the Hoover Dam construction site looking upstream on the Colorado River
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366. Night photograph of power house construction.
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367. Upstream face of Hoover Dam, during construction
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368. View of Hoover Dam during construction
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369. Looking downstream into the Nevada spillway.
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370. Hoover Dam, looking upstream from Lookout Point
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371. Third millionth cubic yard of concrete being lowered to Boulder Dam
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372. View of the Nevada intake towers, taken from the Arizona side.
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373. Interior of power house turbine gallery, Hoover Dam site
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374. Interior of power house gallery, Hoover Dam site
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375. Cleanup site at lower portal of Hoover Dam
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376. View of power house from above -- Hoover Dam site
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377. Looking upstream from the Arizona spillway gate house towards construction on the upstream abatement wall
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378. Construction of Hoover Dam intake towers
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379. Overhead view of Colorado River and outlet works at Hoover Dam
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380. Construction on the Nevada valve house seen from the Arizona side of the Hoover Dam...
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381. Close-up of construction on the Arizona valve house
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382. View of mixing plant
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383. Hoover Dam -- valve outlet on the Arizona side
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384. Hoover Dam -- upstream side
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385. Hoover Dam -- upstream side
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386. Hoover Dam -- upstream side
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387. Hoover Dam -- upstream side
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388. Arizona valve house from the center of the low cat walk
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389. Looking across the downstream face of Hoover Dam, showing the utility towers and elevator shaft
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390. View of construction on the power houses
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391. Construction workers in diversion tunnel, Hoover Dam site
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392. Construction of Hoover Dam diversion tunnel
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393. Working on cofferdam -- Hoover Dam
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394. Construction -- Hoover Dam
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395. Hoover Dam construction
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396. Hoover Dam construction
 

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