@misc{indiciae61a9385453a1,
  title = {Hydrologic unit maps},
  author = {Paul R. Seaber and F. Paul Kapinos and George L. Knapp},
  year = {1987},
  doi = {10.3133/wsp2294},
  url = {https://pubs.usgs.gov/publication/wsp2294},
  note = {Source identifier: wsp2294}
}