@misc{indiciaee24aeb2cfd95,
  title = {Digitized hydrologic units for the United States at a scale of 1:2,500,000},
  author = {K.J. Lanfear and J.C. Schornick},
  year = {1985},
  doi = {10.3133/ofr8592},
  url = {https://pubs.usgs.gov/publication/ofr8592},
  note = {Source identifier: ofr8592}
}