Shows soil types classification by colors and symbols. 'Field operations Bureau of Chemistry and Soils 1930. 'Williams & Heintz Co. Wash. D.C.' Scale 1:63,360. 1 inch = 1 mile. Soils surveyed by C.S. Simmons and R.T. Avon Burke, U.S. Department of Agriculture, and T.M. Bushnell, J.E. Adams and H.P. Ulrich, Purdue University Agricultural Experiment Station.
Simmons, C. S. (Charles Shaffer),1900-cartographer., Burke, R. T. Avon (Richard Thomas Avon),1878-cartographer., Bushnell, T. M. (Thomas Mark),1889-1976, Adams, J. E. (James Edward),1898-cartographer., and Ulrich, H. P. (Herbert Paul),1904-cartographer.