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:
Sixteenyard trucks used in handling spoil on lower level operations in Black Canyon. Here trucks are dumping spoil... 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 Local identifier Department of the Interior Bureau of