@misc{indiciae0031645aa7eb,
  title = {Hydrologic landscape regions of the United States},
  author = {David M. Wolock},
  year = {2003},
  doi = {10.3133/ofr03145},
  url = {https://pubs.usgs.gov/publication/ofr03145},
  note = {Source identifier: ofr03145}
}