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. Dept of Agriculture, Bureau of Soils; State of Indiana, Department of Geology; soils surveyed by W.E. Tharp, of the U.S. Department of Agriculture and E.J. Quinn of the Indiana Department of Geology.