The Hoover Dam under construction in the Boulder Canyon, Nevada, United States of America.
Unused / unissued material - no paperwork - dates unclear or unknown.
Boulder Canyon, Nevada, United States of America (USA).
Full titles read: "THOUSANDS RUSH CONSTRUCTION ON GIANT HOOVER DAM - Greatest reclamation project keeps army of workmen busy."
L/S's of men being lowered down into the canyon by crane. L/S's of workmen drilling holes into the rock to place dynamite into. M/S of workman pushing detonator switch. L/S of explosion from side of the canyon. L/S of construction work over the river. L/S's of tunnels burrowed into rock to "..carry off the water." Nice L/S of boat moving down the river between the canyon walls.
Note: American newsreel.