- E-bookA Colorado History, 10th EditionMaxine Benson
- E-bookMesa Verde National ParkDuane A. Smith
- E-bookThe Trail of Gold and SilverDuane A. Smith
- E-bookPioneers & PoliticiansRichard D. Lamm
- E-bookColoradoThomas J. Noel
- E-bookThe Once and Future Silver Queen of the RockiesChristine Bradley
- E-bookSéries: Mining the American WestMichael A. Amundson