@misc{indiciaeff22c5acb0db,
  title = {Geologic map of the Hillsboro Quadrangle, Sierra and Grant counties, New Mexico},
  author = {David Carl Hedlund},
  year = {1975},
  doi = {10.3133/ofr75108},
  url = {https://pubs.usgs.gov/publication/ofr75108},
  note = {Source identifier: ofr75108}
}