@misc{indiciaefa5cda6c1baf,
  title = {Hydrologic Unit Map -- 1974, State of Kentucky},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1974},
  doi = {10.3133/hu17},
  url = {https://pubs.usgs.gov/publication/hu17},
  note = {Source identifier: hu17}
}