U.S. Geological Survey Scientific Investigations Series 2009-5268
Trends in Water Quality in the Southeastern United States, 1973–2005
/ Title Page / Foreword / List of Tables / List of Figures / Conversions / Introduction / Previous Studies / Data / Methods / Water-Quality Trends / Trend Associations / Summary and Conclusions / References /
Figure 1. The South Atlantic–Gulf and Tennessee study area hydrologic subregions and study sites from NWIS and STORET databases used in trend analysis.
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