Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Chemistry and Soils, 1930.' 'Lith Eastern Offset Inc., Balto.' Scale 1:63,369. 1 inch = 1 mile. U.S. Department of Agriculture, Bureau of Chemistry and Soils; Purdue University Agricultural Experiment Station; soils surveyed by B.H. Hendrickson, U.S. department of Agriculture, in charge, and T.M. Bushnell, H.P. Ulrich and D.R. Kunkel, Purdue University Agricultural Experiment Station.