History Organizations
- Castle Rock Historical Society & Museum
- Palmer Lake Historical Society
- Historic Douglas County, Inc.
- El Paso County Historical Society
- Elbert County Historical Society & Museum
Local Organizations
Research Links
- Douglas County Libraries Archives
- Colorado Historic Newspapers Collection
- Colorado Encyclopedia
- History Colorado Research
- Denver Public Library Western History Collection
- Online Resources for Colorado Archaeology and Historic Preservation (ORCA)
Suggested Reading
- Douglas County Colorado Prehistory to 2020, Weber & Schlupp, 2022
- Douglas County Images of America, Castle Rock Writers, 2017
- D.C. Oakes Family, Friends & Foe, Perkins, 2009