By G.M. Clark, T.R. Maret, M.G. Rupert, M.A. Maupin, W.H. Low, and D.S. Ott
U.S. GEOLOGICAL SURVEY CIRCULAR 1160
The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Government.
ISBN 0-607-89104-1
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U.S. Department of the Interior, U.S. Geological Survey
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