@misc{indiciaeb17381c972d0,
  title = {Temporal changes in sulfate, chloride, and sodium concentrations in four eastern Pennsylvania streams},
  author = {J. L. Barker},
  year = {1986},
  doi = {10.3133/wri854074},
  url = {https://pubs.usgs.gov/publication/wri854074},
  note = {Source identifier: wri854074}
}