@misc{indiciae2bc7bdcbf225,
  title = {Surface water supply of the United States, 1921, Part V, Hudson Bay and upper Mississippi River basins},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1924},
  doi = {10.3133/wsp525},
  url = {https://pubs.usgs.gov/publication/wsp525},
  note = {Source identifier: wsp525}
}