The rarely seen back of the Hoover Dam before it filled with water 1936. pic.twitter.com/HzNmR3elwu
— History In Pictures (@HistoryInPics) April 26, 2014
The rarely seen back of the Hoover Dam before it filled with water 1936. pic.twitter.com/HzNmR3elwu
— History In Pictures (@HistoryInPics) April 26, 2014