TY  - RPRT
TI  - Regional nutrient trends in streams and rivers of the United States, 1993-2003
AU  - Lori A. Sprague
AU  - David L. Lorenz
PY  - 2009
DO  - 10.1021/es803664x
UR  - https://pubs.usgs.gov/publication/70035134
ID  - 70035134
ER  -