Map of the Egeria Springs, Firehole River between the upper and lower Geyser Basins [Yellowstone National Park] / 
Gannett, Henry.
Hayden, Ferdinand Vandeveer.
Mushbach, J. E.
Julius Bien & Co.
[Washington, D.C.] :  Department of the Interior, 
[1878]
In: Twelfth Annual Report of the United States Geological and Geographical Survey of the Territories, &c. Part 2.