- Department of Transportation. Federal Highway Administration. Office of Planning, Environment, and Realty. Office of Natural and Human Environment. National Scenic Byways Program. 1991-9999
- National Archives at College Park - Still Pictures
The original finding aid described this photograph as: Original Caption: Boiling mudpots may not seem like the most inviting sight, but you'll find yourself fascinated by this natural phenomenon. Location: Wyoming (44.462° N 110.855° W) Status: Public domain. Photo by Katie Armstrong of NSBO.