TY  - RPRT
TI  - Nutrients in ground water and surface water of the United States; an analysis of data through 1992
AU  - D. K. Mueller
AU  - P. A. Hamilton
AU  - D.R. Helsel
AU  - K.J. Hitt
AU  - B. C. Ruddy
PY  - 1995
DO  - 10.3133/wri954031
UR  - https://pubs.usgs.gov/publication/wri954031
ID  - wri954031
ER  -