TY  - RPRT
TI  - Design and implementation of a sampling strategy for a water-quality assessment of the Potomac River basin
AU  - J. M. Gerhart
AU  - J. W. Brakebill
PY  - 1996
DO  - 10.3133/wri964034
UR  - https://pubs.usgs.gov/publication/wri964034
ID  - wri964034
ER  -