@misc{indiciae6fbce9dfeb3c,
  title = {Geology of the Mt. Aetna volcanic center, Chaffee and Gunnison Counties, Colorado},
  author = {Priestley Toulmin},
  year = {1984},
  doi = {10.3133/ofr84668},
  url = {https://pubs.usgs.gov/publication/ofr84668},
  note = {Source identifier: ofr84668}
}