TY  - RPRT
TI  - A summary of the U.S. Geological Survey National Water-Quality Assessment program
AU  - R.M. Hirsch
AU  - W.M. Alley
AU  - W. G. Wilber
PY  - 1988
DO  - 10.3133/ofr8895
UR  - https://pubs.usgs.gov/publication/ofr8895
ID  - ofr8895
ER  -