TY  - RPRT
TI  - Estimated anthropogenic nitrogen and phosphorus inputs to the land surface of the conterminous United States--1992, 1997, and 2002
AU  - Lori A. Sprague
AU  - Jo Ann M. Gronberg
PY  - 2013
DO  - 10.3133/sir20125241
UR  - https://pubs.usgs.gov/publication/sir20125241
ID  - sir20125241
ER  -