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.
Hertenstein, Earl,surveyor., Hurst, Lewis A. (Lewis Alexander),1874-cartographer,surveyor., Middleton, Philip (Soil surveyor),surveyor., Tharp, W. E. (William Edgar),surveyor., and Watkins, W. I. (William Isaac),1888-1973,surveyor.