Shows soil types classification by colors and symbols. 'Field Operations Bureau of Soils.' 'Snyder & Black, N.Y.' Scale 1:63,360. 1 inch = 1 mile. U.S. Dept. of Agriculture, Bureau of Soils [and] State of Indiana, Department of Geology; soils surveyed by Lewis A. Hurst, W.I. Watkins, and W.E. Tharp, of the U.S. Department of Agriculture, and Earl Hertenstein and Philip Middleton, of the Indiana Department of Geology.