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:
CloseUp Photograph of Boulder Dam NARA .tif Local identifier AAB Department of the Interior National Park Service Branch of Still and Motion Pictures NARAAuthor Adams Ansel Photographer File CloseUpPhotographofBoulderDam NARA tif tif File CloseUpPhotographofBoulderDam NARA NARAcooperation PDUSGov Hoover Dam as photographed