1914. Peacock, R. H., surveyor., Rose, C. M., surveyor., and Tharp, W. E. (William Edgar),cartographer,surveyor. Shows soil types classification by colors and symbols. 'A. Hoen & Co. Lith. Baltimore, Md.' 'Field operations Bureau of Soils 1914.' Scale 1:63,360... The Bureau.
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1927. Kunkel, D. R. (David Roy),1901-cartographer,surveyor. and Tharp, W. E. (William Edgar),cartographer,surveyor. Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Chemistry and Soils, 1927.' 'Litho Eastern Offset Inc., Balto.'... The Bureau.