The Discovery of Yellowstone Park-Journal of the Washburn Expedition to the Yellowstone and Firehole Rivers in the Year 1870 is a classic nature American nature/outdoors text about the legendary American national park by Nathanial Pitt Langford. This nature study describes the discovery of the great national park, Yellowstone, and includes letters and correspondence from those who were instrumental in the establishment of Yellowstone as America’s greatest natural treasure.