@misc{indiciae6364dd20da39,
  title = {Hydrologic Unit Map-1974, State of North Carolina},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/hu33},
  url = {https://pubs.usgs.gov/publication/hu33},
  note = {Source identifier: hu33}
}