TY  - RPRT
TI  - Relation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River basin
AU  - S.W. Ator
AU  - J. M. Denis
PY  - 1997
DO  - 10.3133/wri964268
UR  - https://pubs.usgs.gov/publication/wri964268
ID  - wri964268
ER  -