@misc{indiciae651ef072291a,
  title = {Quality of surface waters of the United States, 1946},
  author = {C. G. Paulsen},
  year = {1950},
  doi = {10.3133/wsp1050},
  url = {https://pubs.usgs.gov/publication/wsp1050},
  note = {Source identifier: wsp1050}
}