@misc{indiciaee215482c52cd,
  title = {Mercury in the conterminous United States: computerized data file and computer-plotted map of occurrences},
  author = {Jocelyn A. Peterson and Joel R. Bergquist and Judith S. Gassaway},
  year = {1977},
  doi = {10.3133/ofr77859},
  url = {https://pubs.usgs.gov/publication/ofr77859},
  note = {Source identifier: ofr77859}
}