An image showing a bird's eye view of visitors peering over a lookout point at Hoover Dam. Boulder Dam was officially renamed Hoover Dam in 1947. Caption on bottom of image reads: "Lookout Point - Hoover Dam - 293 Oakes."
An image of completed power generators at Hoover Dam. Caption on image reads: "Interior of powerhouse at Boulder Dam, with six 115,000-H.P generators installed. Service Bureau photo." Boulder Dam was officially renamed Hoover Dam in 1947.
An image from the power generator floor of visitors standing on a viewpoint platform inside the Hoover Dam powerhouse. Boulder Dam was officially renamed Hoover Dam in 1947.
An image showing aerial view of Hoover Dam. Parts of the plane from which the image was taken are visible. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of people on a sailboat at Lake Mead. Transcribed text from image: "Sailboat of the eight-meter racing type on Lake Mead, near Boulder Dam." Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Color image of a crowd of protesters at a demonstration held by American Peace Test, a group opposed to nuclear testing. Balloons designed to look like the earth are also visible.
Color image of a crowd of protesters at a demonstration held by American Peace Test, a group opposed to nuclear testing. Protest signs and balloons designed to look like the earth are also visible.