Search for all of "Tunnels", all of "Construction Workers", all of "Six Companies -- Employees"

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1. View of the concrete lining in the diversion tunnels	2. First 40 foot slab of concrete poured in lining diversion tunnels	3. Close-up of trimming jumbo
4. Agitators dumping concrete into buckets	5. View showing method of finishing slabs in invert lining.	6. Trucks hauling concrete in the diversion tunnel
7. Interior of penstock tunnel -- Hoover Dam construction site