@misc{indiciae690077603265,
  title = {Hydrologic Unit Map — 1974, State of Maine},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1974},
  doi = {10.3133/hu19},
  url = {https://pubs.usgs.gov/publication/hu19},
  note = {Source identifier: hu19}
}