@misc{indiciae18286d361139,
  title = {Maps of the United States},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2005},
  doi = {10.3133/70037972},
  url = {https://pubs.usgs.gov/publication/70037972},
  note = {Source identifier: 70037972}
}