@misc{indiciae7236112ae8d1,
  title = {Preliminary map of mercury provinces in the conterminous United States},
  author = {Edwin Wilson Tooker},
  year = {1979},
  doi = {10.3133/ofr79576f},
  url = {https://pubs.usgs.gov/publication/ofr79576F},
  note = {Source identifier: ofr79576F}
}