@misc{indiciaea2a0308769b1,
  title = {USGS Mineral Resources Program; national maps and datasets for research and land planning},
  author = {S. W. Nicholson and D. B. Stoeser and S. D. Ludington and Frederic H. Wilson},
  year = {2001},
  doi = {10.3133/fs07901},
  url = {https://pubs.usgs.gov/publication/fs07901},
  note = {Source identifier: fs07901}
}