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acreage agricultural alluvial annual precipitation Appalachian Plateau Appalachian Valley areas basins bays belt Black Prairie cash crop chernozem climate Coastal Plain colonies confined corn Corn Belt cotton creeks crop production cropland cultivated dairy distribution drainage drained drumlins east eastern economic erosion extent farm income feet fields forest frequently frost-free period frost-free season glacial grazing grown hills humid illus industry irrigation Lake land divisions land use pattern limestone livestock Llano Estacado located loess lower mainly ment miles million acres Mississippi mountains Nashville Basin northern operations Ouachita Mountains parent material pasture Piedmont Plate plateau Pleistocene pocosins population poultry public domain range rectangular region ridges River rolling sand settlement settlers silt loams slopes small grains soils developed southern square miles sugar beets surface swamps Texas tion tract shown lies U. S. Dept United upland usually Valley western wheat wind yields