@misc{indiciae20b7a4b9a246,
  title = {Preliminary geologic map of the Toadlena quadrangle, San Juan County, New Mexico},
  author = {D.L. Ziegler},
  year = {1955},
  doi = {10.3133/coal30},
  url = {https://pubs.usgs.gov/publication/coal30},
  note = {Source identifier: coal30}
}