@misc{indiciae412e4af35c68,
  title = {Quality of surface waters of the United States, 1952. 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 = {1957},
  doi = {10.3133/wsp1251},
  url = {https://pubs.usgs.gov/publication/wsp1251},
  note = {Source identifier: wsp1251}
}