@misc{indiciaebfdafe813cb8,
  title = {Preliminary map of gold provinces in the conterminous United States},
  author = {Edwin Wilson Tooker and Maureen G. Johnson},
  year = {1980},
  doi = {10.3133/ofr79576s},
  url = {https://pubs.usgs.gov/publication/ofr79576S},
  note = {Source identifier: ofr79576S}
}