@misc{indiciaecb479319bc40,
  title = {Occurrence of nitrate and herbicides in ground water in the upper Conestoga River basin, Pennsylvania : water-quality study of the Conestoga River headwaters, Pennsylvania},
  author = {David K. Fishel and Patricia L. Lietman},
  year = {1986},
  doi = {10.3133/wri854202},
  url = {https://pubs.usgs.gov/publication/wri854202},
  note = {Source identifier: wri854202}
}