- E-bookThe Discovery of Yellowstone ParkNathaniel Pitt Langford
- E-bookVigilante Days and WaysNathaniel Pitt Langford
- E-bookVigilante Days and WaysNathaniel Pitt Langford
- E-bookThe Discovery of Yellowstone ParkNathaniel Pitt Langford
- E-bookThe Discovery of Yellowstone Park Journal of the Washburn Expedition to the Yellowstone and Firehole Rivers in the Year 1870Nathaniel Pitt Langford
- E-bookVigilante Days and Ways; The Pioneers of the Rockies (Vol 1)Nathaniel Pitt Langford
- E-bookVigilante Days and WaysNathaniel Pitt Langford