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National Geographic : 1947 May
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U6t Donald E.Hoskins Odd Patterns, Like Tattoo Marks on Earth's Face, Form When Farmers Fight Wind and Water Erosion with Contour Plowing Crooked streaks at right result from contour work, in which furrows follow a level course around hillsides. When fieldsare plowed upand down hillsides, rain and snow water rushes down, washing away much topsoil. In some dry regions, alternate land strips check wind erosion, ordust blowing, onground leftinclean fallow.
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