@misc{indiciae99ae4bcc7d2a,
  title = {Map showing distribution pattern of tungsten from samples of the nonmagnetic fraction of heavy-mineral concentrates, northern Sonora, Mexico},
  author = {Glenn H. Allcott and George VanTrump and Jose Lee-Moreno and Arthur Gomez},
  year = {1977},
  doi = {10.3133/ofr77334},
  url = {https://pubs.usgs.gov/publication/ofr77334},
  note = {Source identifier: ofr77334}
}