Washburn-Langford-Doane Expedition

The Washburn Expedition of 1870, explored the region of northwestern Wyoming that two years later became Yellowstone National Park. Led by Henry Washburn, Nathaniel P. Langford and under U.S. Army escort led by Lt. Gustavus C. Doane, the expedition followed the general course of the Cook–Folsom–Peterson Expedition made the previous year.