@misc{indiciaec56e378ac376,
  title = {Geologic map of the Bayan Obo area, Inner Mongolia, China},
  author = {L. J. Drew and Meng Qingrun},
  year = {1990},
  doi = {10.3133/i2057},
  url = {https://pubs.usgs.gov/publication/i2057},
  note = {Source identifier: i2057}
}