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Soil defense of range and farm lands in the Southwest
E. M. Rowalt · U.S. Department of Agriculture
51 sayfa · 1939
Land use, Rural / Rangelands / Rural Land use / Soil conservation
Soil and water conservation in the Pacific Northwest
E. M. Rowalt · U.S. Dept. of Agriculture
59 sayfa · 1937
Soil conservation / Water conservation / Soil erosion
Soil defense in the Piedmont
E. M. Rowalt, United States. Soil Conservation Service · U.S. Dept. of Agriculture
63 sayfa · 1937
Soil conservation