@misc{indiciae34b329a9b97e,
  title = {National Atlas maps},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1991},
  doi = {10.3133/70039583},
  url = {https://pubs.usgs.gov/publication/70039583},
  note = {Source identifier: 70039583}
}