@misc{indiciaec82a1c25891f,
  title = {County-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States, 2002},
  author = {David K. Mueller and Jo Ann M. Gronberg},
  year = {2013},
  doi = {10.3133/ofr20131065},
  url = {https://pubs.usgs.gov/publication/ofr20131065},
  note = {Source identifier: ofr20131065}
}