The Library offers access to more than 30,000 color and black-and-white photographs taken during geologic studies of the U.S. These images provide a visual history of the discovery, development, and sciences of the United States and its Geological Survey. Some photographs have been used in USGS publications, but most have never been published.
Resource URL: http://libraryphoto.cr.usgs.gov/
Coverage Date: 1868 to present