Washington East of the Cascades Indian Agency
An agency of the Office of Indian Affairs was established in 1857, named the Washington East of the Cascades Agency, for the Nez Perce and other Indian tribes of the area. In 1861, it was renamed the Nez Perce Agency and was responsible only for the Nez Perce Indians.
- Hill, Edward E. (comp.). Guide to Records in the National Archives of the United States Relating to American Indians. Washington DC: National Archives and Records Service, General Services Administration, 1981.
- Hill, Edward E. The Office of Indian Affairs, 1824-1880: Historical Sketches. New York, New York: Clearwater Publishing Company, Inc., 1974.
- Historical Sketches for Jurisdictional and Subject Headings Used for the Letters Received by the Office of Indian Affairs, 1824-1880. National Archives Microcopy T1105.