@misc{indiciae1b046cecb5dd,
  title = {Preliminary geologic map of the Ship Rock and Hogback quadrangles, San Juan County, New Mexico},
  author = {E. C. Beaumont},
  year = {1955},
  doi = {10.3133/coal29},
  url = {https://pubs.usgs.gov/publication/coal29},
  note = {Source identifier: coal29}
}