@misc{indiciae2d898ab72458,
  title = {Hydrologic Unit Map -- 1974, state of Alabama},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1980},
  doi = {10.3133/hu1},
  url = {https://pubs.usgs.gov/publication/hu1},
  note = {Source identifier: hu1}
}