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Journal of Research of the U.S. Geological Survey. September-October 1973. Volume 1, Number 5, pp. 501–625. U.S. Department of the Interior. Annual subscription $15.50 plus $3.75 foreign mailing, to Superintendent of Documents, U.S. Government Printing Office, Washington D.C. 20402.
Published online by Cambridge University Press: 01 May 2009
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- Copyright © Cambridge University Press 1974