@misc{indiciae3e4c8ee917ed,
  title = {United States map indexes},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1998},
  doi = {10.3133/fs19095},
  url = {https://pubs.usgs.gov/publication/fs19095},
  note = {Source identifier: fs19095}
}