TY  - RPRT
TI  - Methods for comparing water-quality conditions among National Water-Quality Assessment Study Units, 1992-1995
AU  - Robert J. Gilliom
AU  - David K. Mueller
AU  - Lisa H. Nowell
PY  - 1998
DO  - 10.3133/ofr97589
UR  - https://pubs.usgs.gov/publication/ofr97589
ID  - ofr97589
ER  -