@misc{indiciae64d01cf9e4e4,
  title = {Counties as of February 1, 1987},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1987},
  doi = {10.3133/32529},
  url = {https://pubs.usgs.gov/publication/32529},
  note = {Source identifier: 32529}
}