TY  - RPRT
TI  - Nitrate in the Mississippi River and its tributaries, 1980-2010: an update
AU  - Jennifer C. Murphy
AU  - Robert M. Hirsch
AU  - Lori A. Sprague
PY  - 2013
DO  - 10.3133/sir20135169
UR  - https://pubs.usgs.gov/publication/sir20135169
ID  - sir20135169
ER  -