TY  - RPRT
TI  - A national look at water quality
AU  - Robert J. Gilliom
AU  - David K. Mueller
AU  - John S. Zogorski
AU  - Sarah J. Ryker
PY  - 2002
UR  - https://pubs.usgs.gov/publication/70180265
ID  - 70180265
ER  -