@misc{indiciae76c61d66a3be,
  title = {Geologic map of the Mule Ear Diatreme, San Juan County, Utah},
  author = {D.E. Stuart-Alexander and E.M. Shoemaker and H. J. Moore},
  year = {1972},
  doi = {10.3133/i674},
  url = {https://pubs.usgs.gov/publication/i674},
  note = {Source identifier: i674}
}