@misc{indiciae240e6a37ddd0,
  title = {Hydrologic Unit Map-1974, State of Oklahoma},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/hu36},
  url = {https://pubs.usgs.gov/publication/hu36},
  note = {Source identifier: hu36}
}