Bushnell, T. M. (Thomas Mark),1889-1976,cartographer,surveyor. and Barrett, Wendell,surveyor.
A. Hoen & Co. Lith. Baltimore, Md.' Includes legend in margins. Scale 1:63,360. 1 inch = 1 mile. Soils surveyed by T.M. Bushnell of the U.S. Department of Agriculture, in charge and Wendell Barrett of the Indiana Department of Geology.
United States Department of Agriculture, Bureau of Soils