@misc{indiciaec3ace6b19e7d,
  title = {Reconnaissance geologic map of the Mount Elbert 15-minute quadrangle, Lake Chaffee, and Pitkin Counties, Colorado},
  author = {Ogden Tweto and J. C. Reed},
  year = {1973},
  doi = {10.3133/ofr73287},
  url = {https://pubs.usgs.gov/publication/ofr73287},
  note = {Source identifier: ofr73287}
}