@misc{indiciaec932325dc5ee,
  title = {Areal and temporal variations in surface-water quality in the Upper Potomac River basin},
  author = {T. J. Trombley},
  year = {1992},
  doi = {10.3133/wri894139},
  url = {https://pubs.usgs.gov/publication/wri894139},
  note = {Source identifier: wri894139}
}