Map shows distribution of soil types by color and symbol. Soils surveyed by T.M . Bushnell of the U.S. Department of Agriculture, and Wendell Barret of the Indiana Department of Geology. 'Field operations, Bureau of Soils, 1917.' Scale approximately 1:63,360. 1 inch = 1 mile. U.S. Department of Agriculture, Bureau of Soils, State of Indiana Department of Geology.
Bushnell, T. M. (Thomas Mark),1889-1976 and Barrett, Wendell