1917. Barrett, Wendell and Bushnell, T. M. (Thomas Mark),1889-1976. 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 Barre... The Bureau.
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1915. Bushnell, T. M. (Thomas Mark),1889-1976 and Erni, C. P. (Chester Prall),1896-cartographer. 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... The Bureau.