@misc{indiciae9fa08d78815a,
  title = {Water-quality assessment of the Potomac River Basin: Analysis of available pesticide data, 1972-1990},
  author = {Humbert Zappia and Gary T. Fisher},
  year = {1997},
  doi = {10.3133/wri974051},
  url = {https://pubs.usgs.gov/publication/wri974051},
  note = {Source identifier: wri974051}
}