@misc{indiciae310ea14f86c1,
  title = {Hydrologic Unit Map-1974, Colorado},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/hu6},
  url = {https://pubs.usgs.gov/publication/hu6},
  note = {Source identifier: hu6}
}