Early period construction of Hoover Dam. Black Canyon shows river in deep valley between cliffs. Man and materials transferred on Catwalk Bridge. Rocks blasted to make ways. Tunnels excavated in mountains by men. Men bore holes in mountain. Man work on steel rods. Trucks loaded with rocks move up the road on mountain. Trucks dump rocks. Tunnels are aligned with concrete after excavation. Men work with equipment. Rocks on top of the cliffs blasted. Men engaged in drilling and handling explosives. Workers transported through cables suspended between cliffs. Men drill holes in Canyon walls. Holes are blasted. Men suspended from cliff-top. River is diverted toward tunnel. River flows into tunnel. Trucks dump rocks. Excavation vehicles used at construction site. Shovel excavator in operation. Dump trucks are driven. Roads carved in mountains to transport men and material. Rock surfaces prepared for the reception of concrete.
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|---|---|---|---|
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