Effect of Contour Cultivation on Crop Yield, Runoff, and Erosion Losses

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110 1 ‡aUnited States. ‡bSoil Conservation Service.
245 1 ‡aEffect of Contour Cultivation on Crop Yield, Runoff, and Erosion Losses.
260 ‡aWashington, ‡bGPO, ‡c1945.
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