@misc{indiciae1b2873a57609,
  title = {Reconnaissance geologic map of the John Day Formation in the southwestern part of the Blue Mountains and adjacent areas, north-central Oregon},
  author = {P.T. Robinson},
  year = {1975},
  doi = {10.3133/i872},
  url = {https://pubs.usgs.gov/publication/i872},
  note = {Source identifier: i872}
}