Areal geology of the Denver Basin, Colorado / 
Gannett, Henry.
Cross, Whitman.
Emmons, Samuel Franklin.
Thompson, A. H.
Julius Bien & Co.
[Washington, D.C. :  Department of the Interior, 
1896]
In: United States Geological Survey. Monograph Vol. 27. Pl. 2.
Inserted in a pocket in the back of the volume.