1906. Mann, Charles J. and Tharp, W. E. (William Edgar). Detached from: Soil survey of Greene County, Indiana / W.E. Tharp and Charles J. Mann. In 36th Annual report of Department of Geology and Natural R... Indiana Department of Geology and Natural Resources and William B. Burford.
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1913. Quinn, E. J. (Edward J.) and Tharp, W. E. (William Edgar). Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Soils, 1913.' 'A Hoen & Co Lith Baltimore Md.' Scale 1:63,360. ... Bureau of Soils.
1912. Quinn, E. J. (Edward J.) and Tharp, W. E. (William Edgar). Shows soil types classification by colors and symbols. 'Field Operations Bureau of Soils 1912.' 'A. Hoen & Co. Lith. Baltimore, Md.' Scale 1:63,360... The Bureau.
1906. Mann, Charles J. and Tharp, W. E. (William Edgar). Shows soil types by colors and symbols. Scale 1:63,360. 1 inch = 1 mile. U.S. Dept. of Agriculture, Bureau of Soils; Indiana Agricultural Experimen... The Bureau.