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