Black and white image of the gravel testing laboratory at the site of the former Stewart Ranch, also known as the Las Vegas Ranch. Standing in the center is Henry Wieking, "setting window and door casements preparatory to rebuilding adobe walls." Site Name: Las Vegas Ranch (Las Vegas, Nev.)

Black and white image with the following printed description: View showing Senator Wm. F. Knowland, left, Mrs. R.A. Taft and Senator Robert A. Taft during a recent visit to world famous Hoover Dam.

A black and white image with the following printed description: Looking down the loading strip at Hemenway Wash, to Lake Mead where the many recreationists launch their boats for various water sports. One of the two boat docks is seen at the left of the strip.

Black and white aerial image of several high scalers at work at the Hoover Dam construction site, specifically in the location for the Arizona-side intake towers. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image with the following printed description: "View showing extension work on Nevada Spillway Tunnel #2 at Hoover Dam. Work performed by Guy F. Atkinson Company of San Francisco, California." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "Looking upstream through Nevada spillway. Overflow weir under construction at right, completed section of channel lining and parapet at left." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "Thirty-foot-diameter-steel-penstock pipe set up from joint assembly at the Babcock and Wilcox Co. Plant." Note: Boulder Dam was officially renamed Hoover Dam in 1947.