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
[Reston, Va.] : U.S. Geological Survey, 
- Title from online title screen.
- Mode of access: Internet from the USGS web site. Address as of 3/21/06: http://water.usgs.gov/nwsum/sal/index.html; current access available via PURL.
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