@misc{indiciaeb63eb00084f2,
  title = {Quality of surface waters of the United States, 1947},
  author = {C. G. Paulsen},
  year = {1952},
  doi = {10.3133/wsp1102},
  url = {https://pubs.usgs.gov/publication/wsp1102},
  note = {Source identifier: wsp1102}
}