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County-level estimates of nitrogen and phosphorus from animal manure for the conterminous United Sta

Mueller, David K., author.
Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2013. 2013

County-level estimates of nitrogen and phosphorus from commercial fertilizer for the conterminous Un

Gronberg, JoAnn M.
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2012. 2012

Development and application of regression models for estimating nutrient concentrations in streams o

Reston, Va. : U.S. Geological Survey, 2010. 2010

Estimation of anthropogenic nitrogen and phosphorus inputs to the land surface of the conterminous U

Sprague, Lori A., author.
Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2013. 2013

Trace elements and radon in groundwater across the United States, 1992-2003

Ayotte, Joseph D.
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, [2011] 2011