TY  - RPRT
TI  - Eutrophication: Nitrate flux in the Mississippi River
AU  - G.F. McIsaac
AU  - M.B. David
AU  - G.Z. Gertner
AU  - D. A. Goolsby
PY  - 2001
DO  - 10.1038/35102672
UR  - https://pubs.usgs.gov/publication/70022957
ID  - 70022957
ER  -