Pen and ink. Base map: Geological Survey (U.S.). State of Indiana, Scale 1:500,000, Washington, D.C., 1950.
Imprint: [Place of publication not identified] : [publisher not identified], [1960?]
Scale: 1:2,027,520; Dimensions: 28 x 19 cm
Coordinates: W0880500 W0844700 N0414500 N0374600