@misc{indiciae7b236c5cc395,
  title = {Geologic map of the Black Range tin district, New Mexico},
  author = {Carl Fries and A.P. Butler},
  year = {1943},
  doi = {10.3133/ofr431},
  url = {https://pubs.usgs.gov/publication/ofr431},
  note = {Source identifier: ofr431}
}