Region 4 (Intermountain)
Region 4 encompasses national forests in Utah, Nevada, southern Idaho, western Wyoming, and parts of Colorado and California.
- USDA Forest Service. Payette National Forest, Idaho, 1941.
- Smith, Elizabeth. The History of the Salmon National Forest 1973.
- Ortman, Tom. Bury My Soul Near Krassel Hole: A History of the Krassel District, 1975. [PDF]
- Alexander, Thomas G. The Rise of Multiple-Use Management in the Intermountain West: A History of Region 4 of the Forest Service, 1987.