"1925 General view of Downstream Cofferdam and excavation m river bed for Power House, February 10th, 1933.
1996 View of the Himix Concrete Mixing Plant. February 28th, 1933.
1992 Looking downstream in Black Canyon from the upstream Cofferdam, showing excavation activities in river bed.
February 27th, 1933.
2011 Looking upstream on the Nevada side, showing weir foundation at the Nevada Spillway. March 2nd, 1933."