@misc{indiciae3c31242b8ed8,
  title = {Hydrologic Unit Map -- 1974, state of Arizona},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/hu3},
  url = {https://pubs.usgs.gov/publication/hu3},
  note = {Source identifier: hu3}
}