Search for all of "Black Canyon", all of "Construction Workers", all of "Trucks"

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1. Panorama view, showing Six Companies Inc. work on the Arizona side of Black Canyon Highway.	2. View of construction on roads around the Arizona spillway	3. Hoover Dam construcion -- blasting
4. Transport trucks at Hoover Dam site	5. Construction at lower portal of Hoover Dam	6. Power houses being constructed at Hoover Dam
7. Construction workers with electric light reflectors standing by a truck in Black Canyon	8. View of power houses being constructed at the Hoover Dam site