Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Soils, 1915.' 'Snyder & Black, N.Y.' Scale 1:63,360. 1 inch = 1 mile. U.S. Dept. of Agriculture, Bureau of Soils; State of Indiana, Department of Geology; soils surveyed by T.M. Bushnell, of the U.s. Department of Agriculture, in charge, and C.P. Erni, of the Indiana Department of Geology.
Bushnell, T. M. (Thomas Mark),1889-1976 and Erni, C. P. (Chester Prall),1896-cartographer.