TY  - RPRT
TI  - Estimates of diffuse phosphorus sources in surface waters of the United States using a spatially referenced watershed model
AU  - R. B. Alexander
AU  - R. A. Smith
AU  - G. E. Schwarz
PY  - 2004
DO  - 10.2166/wst.2004.0150
UR  - https://pubs.usgs.gov/publication/70027214
ID  - 70027214
ER  -