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U.S. Geological Survey Scientific Investigations Series 2009-5268

Trends in Water Quality in the Southeastern United States, 1973–2005

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Figure 8. Recent (1993–2005) trends in total nitrogen concentration at sites from the National Water Information System (NWIS) and Storage and Retrevial (STORET) databases


Figure 8. Recent (1993–2005) trends in total nitrogen concentration at sites from the National Water Information System (NWIS) and Storage and Retrieval (STORET) databases.

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