TY  - RPRT
TI  - National water-quality assessment: Future directions of the U.S. Geological Survey
AU  - Philip Cohen
AU  - William M. Alley
AU  - William G. Wilber
PY  - 2007
DO  - 10.1111/j.1752-1688.1988.tb03032.x
UR  - https://pubs.usgs.gov/publication/70014296
ID  - 70014296
ER  -