Grand Coulee Dam (Wash.);Hydroelectric power plants -- Washington (State);Dams -- United States -- Design and construction.
Small version of the concrete buckets used during the construction of Grand Coulee Dam. The ones used on Grand Coulee Dam were larger, with a four cubic-yard capacity.
Dams -- United States -- Design and construction; Construction workers -- United States.
Hard hat worn by construction workers on Grand Coulee Dam. Early version of hard hat was plastic resin impregnated fabric. This one was worn by project engineer Frank Banks.