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.
Search Results
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.