@misc{indiciaedd0cdf5adb30,
  title = {Geologic map of the South Mamm Peak quadrangle, Garfield and Mesa Counties, Colorado},
  author = {John R. Donnell and Warren E. Yeend},
  year = {1960},
  doi = {10.3133/ofr6881},
  url = {https://pubs.usgs.gov/publication/ofr6881},
  note = {Source identifier: ofr6881}
}