Soller, D.R., 1993, Preliminary map showing the thickness and character of Quaternary sediments in the United States east of the Rocky Mountains: U.S. Geological Survey, Open-File Report OF-93-543, scale 1:3,500,000
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Soller, D.R., 1993, Preliminary map showing the thickness and character of Quaternary sediments in the United States east of the Rocky Mountains: U.S. Geological Survey, Open-File Report OF-93-543, scale 1:3,500,000
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