Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Soils, 1913.' '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 W.E. Tharp of the U.S. Department of Agriculture and E.J. Quinn of the Indiana Department of Geology.
Quinn, E. J. (Edward J.) and Tharp, W. E. (William Edgar)