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Please consult the orignial MGS data, maps, and metadata at: http://conservancy.umn.edu/handle/11299/57004\n\nAccording to the MGS, information that was used to map sand and gravel deposits used various criteria. Several operators and consultants in the aggregate industry, staff of the Materials Division of the Minnesota Department of Transportation and the Division of Minerals of the Minnesota Department of Natural Resources helped to establish the criteria. Deposits are classified by percentage of material retained on the number 4 sieve (4.76-millimeter pore space), sand and gravel thickness, thickness of overlying deposits, location of the water table, and relative amounts of subsurface information available \n\nData was divided into primary sources, potential secondary sources, and gravel pits. It was subdivied by sieve data, thickness of sand and gravel deposit, thickness of overlying sediments, position of water table, and finaly data reliability. 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