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Distribution of the great soil groups (soil provinces)
21198_zz002cfmmg
United States
Relief shown by spot heights. Appears in Washington: U.S. Dept. of Agriculture. Atlas of American agriculture, 1936. Soils, plate 2.
1931
Marbut, Curtis Fletcher, 1863-1935.
Washington, D.C. : Bureau of Chemistry and Soils
31 × 61 cm
1 : 8000000
