TY  - RPRT
TI  - County-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States, 2007 and 2012
AU  - JoAnn M. Gronberg
AU  - Terri Arnold
PY  - 2017
DO  - 10.3133/ofr20171021
UR  - https://pubs.usgs.gov/publication/ofr20171021
ID  - ofr20171021
ER  -