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Oct 30, 1991
Information Series
Dec 31, 1991
Open File Report
Dec 31, 1991
Open File Report
Dec 31, 1990
Open File Report
Dec 31, 1989
Open File Report
Aug 31, 1991
Open File Report
Aug 31, 1983
Open File Report
Dec 31, 1971
Earth Sciences Report
Dec 14, 2005
Information Series
Sep 30, 2002
Earth Sciences Report