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