@misc{indiciae52164400ea4d,
  title = {Photogeologic map of the Delta quadrangle, Montrose and Delta Counties, Colorado},
  author = {C. H. Marshall},
  year = {1959},
  doi = {10.3133/i282},
  url = {https://pubs.usgs.gov/publication/i282},
  note = {Source identifier: i282}
}