United States, Bureau of Soils. U.S. Dept. of Agriculture, Bureau of Soils ; soils surveyed by Cornelius Van Dyne. Shows soil type classification by colors and symbols. Relief sho... The Bureau.
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United States, Bureau of Soils. U.S. Dept. of Agriculture, Bureau of Soils, University of California, Agricultural Experiment Station. Relief shown by contours and spot heights. I... The Bureau.
United States, Bureau of Soils., Krusekopf, Henry Herman, 1886-, and University of Missouri--Columbia, Agricultural Experiment Station. Color map showing the distribution of soils by colors and symbols. Other signs in the legend include: culture (cities, roads, bridges, railroads), ... The Bureau.