@misc{indiciaed2ef9ce6a30f,
  title = {Geology of the Trinidad-Aguilar area, Las Animas and Huerfano Counties, Colorado},
  author = {R. L. Harbour and G. H. Dixon},
  year = {1956},
  doi = {10.3133/om174},
  url = {https://pubs.usgs.gov/publication/om174},
  note = {Source identifier: om174}
}