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U.S. Geological Survey Computer Contributions available from the National Technical Information Service: Springfield,VA 22151, U.S.A. When ordering refer to the title and PB numbers. Paper copy, $3·00 or microfiche. $1·45 (U.S.) each

Authors:	D.F. Merriam

Affiliation:	Department of Geology Syracuse University Syracuse, NY 13210, U.S.A.

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