U.S. Geological Survey Open-File Report 2010-1178
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By E.A. Pendleton, W.E. Baldwin, W.W. Danforth, N.T. Dewitt, A.S. Forde, D.S. Foster, K.W. Kelso, W.R. Pfeiffer, A.M. Turecek, J.G. Flocks, and D.C. Twichell U.S. Department of the Interior U.S. Geological Survey U.S. Geological Survey, Reston, Virginia: 2011
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