Construction of Boulder Dam, Boulder City, Nevada--Using a 150-ton capacity cableway to lower a 140-ton penstock section into the canyon

In album: Boulder Dam: a portfolio of photographs prepared for Hon. Harold L. Ickes, Secretary of the Interior, photographs and format by B.D. Glaha, Boulder City, Nevada, 1934.
Published in: Photographic memory: the album in the age of photography / Verna Posever Curtis. New York, NY : Aperture Foundation, 2011, p. 91.