TY  - RPRT
TI  - Areal and temporal variations in surface-water quality in the Upper Potomac River basin
AU  - T. J. Trombley
PY  - 1992
DO  - 10.3133/wri894139
UR  - https://pubs.usgs.gov/publication/wri894139
ID  - wri894139
ER  -