@misc{indiciae669eaa3ca3da,
  title = {Preliminary results of 1978 coal exploratory drilling in the Trinidad-Raton coal region, Las Animas County, Colorado},
  author = {Walter Danilchik},
  year = {1978},
  doi = {10.3133/ofr781101},
  url = {https://pubs.usgs.gov/publication/ofr781101},
  note = {Source identifier: ofr781101}
}