@misc{indiciaed4512db93151,
  title = {1:2,000,000-scale Hydrologic Units of the United States},
  author = {John Watermolen},
  year = {1999},
  doi = {10.3133/70046629},
  url = {https://pubs.usgs.gov/publication/70046629},
  note = {Source identifier: 70046629}
}