Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Soils, 1912.' A. 'Hoen & co. Lith. Baltimore, Md.' Scale 1:63,360. 1 inch = 1 mile U.S. Department of Agriculture, Bureau of Soils; State of Indiana, Department of Geology; soils surveyed by Grove B. Jones of the U.S. Department of Agriculture and C.H. Orahood of the Indiana Department of Geology.