@misc{indiciae15ed348a76a9,
  title = {Variations in the chemical character of the Susquehanna River at Harrisburg, Pennsylvania},
  author = {Peter W. Anderson},
  year = {1963},
  doi = {10.3133/wsp1779b},
  url = {https://pubs.usgs.gov/publication/wsp1779B},
  note = {Source identifier: wsp1779B}
}