@misc{indiciaead97165aa18e,
  title = {Preliminary geologic map of the Grey Hill Spring Quadrangle, San Juan and McKinley counties, New Mexico},
  author = {R. B. O'Sullivan and D. L. Weide and G. R. Scott},
  year = {1989},
  doi = {10.3133/mf2069},
  url = {https://pubs.usgs.gov/publication/mf2069},
  note = {Source identifier: mf2069}
}