@misc{indiciae625ad76d0c72,
  title = {Stream reconnaissance for nutrients and other water-quality parameters, Greater Pittsburgh Region, Pennsylvania},
  author = {Robert M. Beall},
  year = {1975},
  doi = {10.3133/wri7450},
  url = {https://pubs.usgs.gov/publication/wri7450},
  note = {Source identifier: wri7450}
}