@misc{indiciae506b89f6f15a,
  title = {Quality of surface waters of the United States, 1949 : Parts 1 -6},
  author = {C. G. Paulsen},
  year = {1953},
  doi = {10.3133/wsp1162},
  url = {https://pubs.usgs.gov/publication/wsp1162},
  note = {Source identifier: wsp1162}
}