@misc{indiciae44bb10ca99ce,
  title = {Reconnaissance geologic map of the Colona Quadrangle, Montrose and Ouray counties, Colorado},
  author = {W. J. Hail},
  year = {1987},
  doi = {10.3133/mf2003},
  url = {https://pubs.usgs.gov/publication/mf2003},
  note = {Source identifier: mf2003}
}