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U S Geological Survey Water Supply Paper : Stream water quality in the conterminous United States--status and trends of selected indicators during the 1980's / by Richard A. Smith, Richard B. Alexander, and Kenneth J. Lanfear.
U S Imports History Dvd Rom : U.S. imports history : historical summary ... : international harmonized system commodity classification (HTSUSA) by country, by customs district / Foreign Trade Division.