@misc{indiciae381408531a1a,
  title = {Quality of surface waters of the United States, 1970, Part 7, Lower Mississippi River basin},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/wsp2156},
  url = {https://pubs.usgs.gov/publication/wsp2156},
  note = {Source identifier: wsp2156}
}