U.S. Geological Survey Open-File Report 2010-1178
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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