@misc{indiciae40d69b45a367,
  title = {Mode of igneous intrusion in La Plata Mountains, Colorado},
  author = {E.B. Eckel},
  year = {2014},
  doi = {10.1029/tr018i001p00258},
  url = {https://pubs.usgs.gov/publication/70207269},
  note = {Source identifier: 70207269}
}