Black and white image of Hoover Dam with the following printed description: "View of 50-foot diameter tunnel below Arizona Tunnel Plug outlet works with Stoney Gate at end of tunnel lowered." Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of Hoover Dam's upstream side. Text from image reads: "Looking Upstream from Boulder Dam, Showing Lower Lake Mead and Highway from Kingman, Arizona [copyright] BDSB." Note: Boulder Dam was officially renamed Hoover Dam in 1947.