UC Boulder Collections

Aerial photographs dramatically portray the changing landscape of Colorado: a mountain valley can be seen where there is now a reservoir; changes in the vegetation and ground cover can be traced over the years, and the growth of towns and cities documented. This collection provides access to almost 1,700 digitized aerial photographs of Colorado taken by the U.S. Forest Service in the years from 1938 to 1947. Each photograph is identified by a project or county code followed by the roll and frame numbers assigned by the photographing agency.