Old photographs are a valuable resource for treasure hunters!
"Over 30,000 photographs, drawn from the holdings of the Western History and Genealogy Department at Denver Public Library, illuminate many aspects of the history of the American West. Most of the photographs were taken between 1860 and 1920. They illustrate Colorado towns and landscape, document the place of mining in the history of Colorado and the West, and show the lives of Native Americans from more than forty tribes living west of the Mississippi River. Also included are World War II photographs of the 10th Mountain Division, ski troops based in Colorado who saw action in Italy. "
http://memory.loc.gov/ammem/award97/codhtml/hawphome.html
I appologize if this has already been posted. I did not see it listed in a search for "library"
Boogie