Relation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River Basin /
by Scott W. Ator and Janet M. Denis ; prepared as part of the National Water-Quality Assessment (NAWQA) Program.

APA Citation

Ator, S. W., Denis, J. M., Geological Survey (U.S.)., National Water-Quality Assessment Program (U.S.). (1997). Relation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River Basin. Baltimore, Md.: U.S. Dept. of the Interior, U.S. Geological Survey .

MLA Citation

Ator, Scott W, Janet M Denis, Geological Survey (U.S.), and National Water-Quality Assessment Program (U.S.). Relation of Nitrogen And Phosphorus In Ground Water to Land Use In Four Subunits of the Potomac River Basin. Baltimore, Md.: U.S. Dept. of the Interior, U.S. Geological Survey , 1997.