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Regional Assessments of Nutrient Sources and Transport to Streams, Reservoirs, and Estuaries

Spatial Distribution of the Largest Sources of (A) Total Nitrogen as Estimated Using Six Separate
Regional SPARROW Models. Sources are aggregated in classes that are less detailed than those defined for the models individually and
include point sources, developed land, crops (i.e., fertilizer application), manure generation, atmospheric deposition, and background sources.


The full study and findings can be accessed at: http://water.usgs.gov/nawqa/sparrow/mrb/

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