TY  - RPRT
TI  - The quality of our nation's waters: Nutrients and pesticides
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1999
DO  - 10.3133/cir1225
UR  - https://pubs.usgs.gov/publication/cir1225
ID  - cir1225
ER  -