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451. Valve house during Hoover Dam construction
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452. Interior of valve house, Hoover Dam construction
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453. View of Hoover Dam construction from the top of the dam
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454. Hoover Dam under construction
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455. Interior of diversion tunnel during Hoover Dam construction
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456. Switchyard at Hoover Dam during construction
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457. Interior of Hoover Dam diversion tunnel during construction
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458. Panorama looking downstream showing dam, spillways, intake towers and cableways
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459. Arizona spillway, looking upstream.
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460. Trash rack at the upper portals of diversion tunnnel no. 2.
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461. Boulder Dam, Hoover Dam looking upstream from the Nevada side.
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462. Looking upstream toward the upper plug and raise, in diversion tunnel no. 3.
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463. Hoover Dam during construction
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464. Power house during construction -- Hoover Dam
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465. President Roosevelt dedicating Hoover Dam
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466. Nevada intake towers -- Hoover Dam site
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467. Interior of diversion tunnel during Hoover Dam construction
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468. View of switchyard at Hoover Dam site
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469. Hoover Dam during construction
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470. View of power house from above -- Hoover Dam site
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471. Hoover Dam from the Arizona side
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472. Looking upstream toward Lake Mead
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473. Spillway during Hoover Dam construction
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474. Hoover Dam construction -- spillway
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475. View of construction on roads around the Arizona spillway
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476. Upstream view of the completed Nevada spillway drainage flume and surrounding area in Black Canyon
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477. Looking upstream from the Arizona spillway gate house towards construction on the upstream abatement wall
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478. View of Hoover Dam from the Nevada side, showing the dam, the intake towers, spillways,...
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479. Interior of the Nevada valve house
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480. Steel rails on the roof of the Nevada valve house awaiting concrete pouring
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481. Looking into the Arizona spillway raise.
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482. Arizona spillway bridge under construction
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483. Construction on the Nevada spillway
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484. Overhead view of construction on the Arizona valve house
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485. View of the Hoover Dam costruction site from the lower cofferdam
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486. Construction on the Nevada power house
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487. Construction on the Arizona power house
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488. Diversion tunnel no. 1 trashrack and counterweight assembly just prior to the diverting of the...
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489. Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion...
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490. Outlet works -- Hoover Dam
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491. Outlet works -- Hoover Dam
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492. Outlet works -- Hoover Dam -- night view
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493. Construction -- Hoover Dam outlet works
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494. Intake towers -- Hoover Dam
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495. Night construction -- intake tower at Hoover Dam
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496. Hoover Dam during construction
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497. Hoover Dam spillways
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498. Hoover Dam -- at night
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499. Hoover Dam -- interior
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500. Construction of Hoover Dam intake towers
 

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