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1999 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

u.s. geological survey open file report/open-file report

Summary of data for quality assessment materials analyzed from January 1994 through November 1998 using the NAWQA Program bed-sediment analytical protocol