TY  - RPRT
TI  - Regional interpretation of water-quality monitoring data
AU  - Richard A. Smith
AU  - Gregory E. Schwarz
AU  - Richard B. Alexander
PY  - 1997
DO  - 10.1029/97wr02171
UR  - https://pubs.usgs.gov/publication/70019376
ID  - 70019376
ER  -