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The color of soils

Robinson, W. O. (William Orrin), b. 1884, McCaughey, W. J. (William John), 1882-1962, United States. Dept. of Agriculture, United States. Bureau of Soils, United States. Government Printing Office · 1911 · Washington : Govt. Print. Off. · 2 pictures

Soils Color · Soils Composition

Internet Archive · U.S. Department of Agriculture, National Agricultural Library · Public domain (published before 1931) · More from this library