@misc{indiciae6ff0207882a5,
  title = {Surface-water quality in Pequea Creek basin, Pennsylvania, 1977-79},
  author = {J. R. Ward},
  year = {1987},
  doi = {10.3133/wri854250},
  url = {https://pubs.usgs.gov/publication/wri854250},
  note = {Source identifier: wri854250}
}