@misc{indiciae0918a1c64964,
  title = {Map Indexes Available from the U.S. Geological Survey},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2001},
  doi = {10.3133/fs13401},
  url = {https://pubs.usgs.gov/publication/fs13401},
  note = {Source identifier: fs13401}
}