Colorado Office of Archaeology and Historic Preservation: National and State Register information including listed properties, nomination forms, deadlines, and ten basic steps to listing property.
Colorado State Penitentiary: History of the Colorado State Penitentiary, corrections records, and prisoner index.
Colorado State University: A complete history of the university, starting from 1870 when it was founded as the Agricultural College of Colorado.
Rocky Mountain National Park History: D. Ferrel Atkins' brief history of the park.
The History of Pearl Lake State Park: Pearl Lake State Park has an exciting history which dates back to the Colorado/Wyoming range wars. Site dedicated to historic preservation and education.