@misc{indiciae139032eb263d,
  title = {Geology and mineral deposits of the Steeple Rock and Duncan mining districts, Grant and Hidalgo counties, New Mexico, and Greenlee County, Arizona},
  author = {D. C. Hedlund},
  year = {1990},
  doi = {10.3133/ofr90239},
  url = {https://pubs.usgs.gov/publication/ofr90239},
  note = {Source identifier: ofr90239}
}