@misc{indiciae9d089d75eb2a,
  title = {Geologic map of the Tillie Hall Peak quadrangle, Greenlee County, Arizona, and Grant County, New Mexico},
  author = {David Carl Hedlund},
  year = {1993},
  doi = {10.3133/gq1715},
  url = {https://pubs.usgs.gov/publication/gq1715},
  note = {Source identifier: gq1715}
}