Geologic formations of Illinois and Western Indiana. Compiled from Worthen's Map of Illinois ... andPhinney's Map of Indiana ... /
Worthen, A. H.
Leverett, Frank,1859-1943.
Phinney,.
Julius Bien & Co.
[Washington, D.C. : Department of the Interior,
1899]
In: United States Geological Survey. Monograph Vol. 38 p. 21.