TY  - RPRT
TI  - Nutrients in streams and rivers across the nation — 1992–2001
AU  - David K. Mueller
AU  - Norman E. Spahr
PY  - 2006
DO  - 10.3133/sir20065107
UR  - https://pubs.usgs.gov/publication/sir20065107
ID  - sir20065107
ER  -