1934. Bushnell, T. M. (Thomas Mark),1889-1976, Carlson, E. E., Maxwell, D. C., Shearin, A. E., and Waggoner, M. E. (Morris Edward). At bottom left: Base map by U.S. Geological Survey, 1930. Scale 1:500,000 U.S. Department of Agriculture, Soil Conservation Service; Indiana erosio... United States Department of Agriculture, Soil Conservation Service.
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1930. Adams, J. E. (James Edward), 1898-, Burke, R. T. Avon (Richard Thomas Avon), 1878-cartographer., Bushnell, T. M. (Thomas Mark),1889-1976, Simmons, C. S. (Charles Shaffer),1900-cartographer., and Ulrich, H. P. (Herbert Paul), 1904-cartographer. Shows soil types classification by colors and symbols. 'Field operations Bureau of Chemistry and Soils 1930. 'Williams & Heintz Co. Wash. D.C.' Sca... Bureau of Chemistry and Soils.
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.
1915. Barrett, Wendell, Bushnell, T. M. (Thomas Mark),1889-1976, and Grimes, E. J. (Earl Jerome),1893-cartographer. Detached from: Soil survey of Starke County, Indiana / E.J. Grimes, Wendell Barrett, and T.M. Bushnell. In 40th Annual report of Department of Geol... Indiana Department of Geology and Natural Resources, Fort Wayne, and Fort Wayne Printing Company.
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.