@misc{indiciae5f87e3b4201e,
  title = {Geologic map of the Hard Ground Flats quadrangle, McKinley County, New Mexico},
  author = {A. R. Kirk and R. S. Zech},
  year = {1987},
  doi = {10.3133/gq1592},
  url = {https://pubs.usgs.gov/publication/gq1592},
  note = {Source identifier: gq1592}
}