@misc{indiciae609c0ad85440,
  title = {Laramide-Tertiary intrusive rocks of Colorado},
  author = {Edward J. Young},
  year = {1972},
  doi = {10.3133/ofr72456},
  url = {https://pubs.usgs.gov/publication/ofr72456},
  note = {Source identifier: ofr72456}
}