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Soil Plasticity and Expansion Potential
web.mst.eduUSDA-NRCS Soils Maps In the United States pedological information is contained in soil survey reports published by the U.S. Department of Agriculture (USDA). Around 1960, the SCS began publishing reports contain sections on engineering properties of the mapped soils with map scales of 1 inch to 2,000 feet (1:24,000), on aerial