@misc{indiciae3158d25ca7cf,
  title = {Quality of surface waters of the United States, 1964, Parts 5 and 6, Hudson Bay and upper Mississippi River basins and Missouri River basin},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/wsp1956},
  url = {https://pubs.usgs.gov/publication/wsp1956},
  note = {Source identifier: wsp1956}
}