U.S. Geological Survey Open-File Report 2012-1157
By Elizabeth A. Pendleton, Wayne E. Baldwin, Walter A. Barnhardt, Seth D. Ackerman, David S. Foster, Brian D. Andrews, and William C. Schwab Note: To download a printer-friendly PDF copy of this report including figures, Click Here! U.S. Department of the Interior U.S. Geological Survey U.S. Geological Survey, Reston, Virginia: 2013
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