TY  - RPRT
TI  - Analysis and interpretation of water-quality trends in major U.S. rivers, 1974-81
AU  - Richard A. Smith
AU  - Richard B. Alexander
AU  - M. Gordon Wolman
PY  - 1987
DO  - 10.3133/wsp2307
UR  - https://pubs.usgs.gov/publication/wsp2307
ID  - wsp2307
ER  -