@misc{indiciae0df5983826c5,
  title = {Chemical quality of surface waters in Pennsylvania},
  author = {Charles N. Durfor and Peter W. Anderson},
  year = {1963},
  doi = {10.3133/wsp1619w},
  url = {https://pubs.usgs.gov/publication/wsp1619W},
  note = {Source identifier: wsp1619W}
}