Cover Image: USGS Circular 1381
![Image: Cover Image: USGS Circular 1381](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/circ1381_cover_for_web.jpg?itok=Nw4e07La)
Detailed Description
Cover image: USGS Circular 1381. View of Boulder Basin, Lake Mead, at sunset looking east. The flat topped mountain in the background is Fortification Hill, a well-known landmark in the viewshed from Hoover Dam.
Sources/Usage
Public Domain.