TY  - RPRT
TI  - Regional estimates of the amount of U.S. agricultural land located in watersheds with poor water quality
AU  - Richard A. Smith
AU  - Gregory E. Schwarz
AU  - Richard B. Alexander
PY  - 1994
DO  - 10.3133/ofr94399
UR  - https://pubs.usgs.gov/publication/ofr94399
ID  - ofr94399
ER  -