@misc{indiciae621234faa29d,
  title = {Preliminary geologic map of the Trail Mountain Quadrangle, Grand County, Colorado},
  author = {Glen A. Izett},
  year = {1972},
  doi = {10.3133/ofr73128},
  url = {https://pubs.usgs.gov/publication/ofr73128},
  note = {Source identifier: ofr73128}
}