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by David A. Lindsey, William H. Langer, and Daniel H. Knepper, Jr
U.S. Dept. of the Interior, U.S. Geological Survey 2005 Geological Survey professional paper 1705
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by USGS Front Range Infrastructure Resources Project ; Daniel H. Knepper, Jr., editor ; contributors, Belinda F. Arbogast ... [et al.]
U.S. Department of Interior : U.S. Geological Survey [2002] U.S. Geological Survey circular 1219
by Belinda F. Arbogast, Daniel H. Knepper, Jr., and William H. Langer
U.S. Geological Survey 2000 U.S. Geological Survey circular 1191