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801. Colorado River -- Beginning construction -- Hoover Dam
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802. Colorado River -- Hoover Dam site
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803. Railroad cars transporting materials for Hoover Dam construction
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804. Colorado River before Hoover Dam was built
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805. Preliminary construction at Hoover Dam site
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806. Hoover Dam construction
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807. Hoover Dam construction
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808. Colorado River, early stages of dam construction
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809. Hoover Dam construction
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810. Hoover Dam construction
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811. Hoover Dam construction
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812. Hoover Dam construction
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813. Colorado River -- Hoover Dam construction site
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814. Hoover (not Boulder) Dam from the Arizona side
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815. Hoover (not Boulder) Dam from the Arizona side
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816. Hoover (not Boulder) Dam from the Arizona side
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817. Hoover (not Boulder) Dam from Arizona side
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818. Penstocks at Hoover Dam construction site
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819. Penstock pipe at Babcock & Wilcox Plant
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820. Penstock pipes -- Babcock & Wilcox Plant
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821. Penstock pipes at Babcock & Wilcox Plant
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822. Penstock pipes in Babcock & Wilcox Plant
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823. Hoover Dam construction -- various phases
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824. Construction of Hoover Dam
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825. Penstock pipes at Babock & Wilcox Plant
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826. Penstock pipes at Babcock & Wilcox Plant
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827. Penstock pipes at Babcock & Wilcox Plant
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828. Penstock pipe at Babcock & Wilcox Plant
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829. Hydraulic turbine for Hoover Dam
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830. Diversion tunnel -- Hoover Dam
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831. Working on cofferdam -- Hoover Dam
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832. Upper portals -- Hoover Dam site
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833. Work on cofferdam -- Hoover Dam
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834. Construction -- Hoover Dam
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835. Hoover Dam construction workers
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836. Hoover Dam construction equipment
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837. Construction equipment -- Hoover Dam
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838. Hoover Dam construction
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839. Hoover Dam construction
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840. Hoover Dam construction equipment
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841. Hoover Dam construction
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842. Hoover Dam construction
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843. Cement plant at Hoover Dam site
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844. Cement plant -- Hoover Dam site
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845. Cement plant -- Hoover Dam site
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846. Hoover Dam construction
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847. Hoover Dam construction
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848. Hoover Dam -- diversion tunnels in use
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849. Hoover Dam -- diversion tunnels in use
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850. Aerial view of Hoover Dam
 

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