@misc{indiciaea70e13f672e5,
  title = {Occurrence of pesticide residues in four streams draining different land-use areas in Pennsylvania},
  author = {John F. Truhlar and Lloyd A. Reed},
  year = {1975},
  doi = {10.3133/wri756},
  url = {https://pubs.usgs.gov/publication/wri756},
  note = {Source identifier: wri756}
}