Search for all of "Tunnels", all of "Hoover Dam ariz And Nev -- Design And Construction", all of "Boulder Dam Service Bureau"

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Construction in diversion tunnel -- Hoover Dam View of the drilling jumbo working in one of the diversion tunnels during the construction of Hoover Dam.
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Construction workers in diversion tunnel, Hoover Dam site Shows construction workers posing on the drilling jumbo inside a diversion tunnel during the construction of Hoover Dam. Other men are standing on the floor of the tunnel looking up at the jumbo. Electric lights illuminate the tunnel.
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Diversion tunnel under construction at Hoover Dam site View of the interior of one of the diversion tunnels during construction at Hoover Dam. Electric lights illuminate the scene.
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Construction workers inside Hoover Dam diversion tunnel Shows a power shovel dumping concrete into a dump truck inside a diversion tunnel during the construction of Hoover Dam. Construction workers are visible at work.
 

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