@misc{indiciae3c631017e8bf,
  title = {Land use and land cover, 1973-76, Bluefield, West Virginia; Virginia; Kentucky},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/l109},
  url = {https://pubs.usgs.gov/publication/l109},
  note = {Source identifier: l109}
}