Search for all of "Tunnels", all of "Construction Workers", all of "Boulder Dam Service Bureau"

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1 Object thumbnail
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.
2 Object thumbnail
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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