An image of hydroelectric generators inside the powerhouse at Hoover Dam. A man standing next to one of the generators shows their scale. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
A view of the Winged Figures of the Republic at Hoover Dam; the inscription at the base of the flagpole is printed on the postcard: "It is fitting that the flag of our country should fly here in honor of those men who , inspired by a vision of lonely land, made fruitful, conceived this great work, and of those others whose genius and labor made that vision a reality."