Photograph in lower left corner shows a man and a woman posing underneath a stone arch with a large bell hanging from it, and a sign reading "Hermit's Rest."
High scaling during early constuction at Boulder Dam [left], Transporting men by cableway, Boulder Dam [middle], Boulder Dam dowstream face and power house [right], 1931-1936
Photograph in upper left corner identified as Irv Armstrong, 1907. Photograph in lower left corner identified as on the Colorado River, 1907. Photograph in upper right corner identified as Eldorado Cañon, 1907.