This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Excavation for major structures NARA .tif Scope and content Photograph from Volume Two of series of photo albums documenting the construction of Hoover Dam Boulder City Nevada General notes This is compilation of photographs showing excavation scenes It bears an ink stain at the bottom of the panel Local identifier Department