@misc{indiciae7eb244780e9c,
  title = {Classification and Mapping of Agricultural Land for National Water-Quality Assessment},
  author = {Robert J. Gilliom and Gail P. Thelin},
  year = {1997},
  doi = {10.3133/cir1131},
  url = {https://pubs.usgs.gov/publication/cir1131},
  note = {Source identifier: cir1131}
}