@misc{indiciaead013246b26a,
  title = {Geology, structure, and uranium deposits of the Gallup 1 x 2 Quadrangle, New Mexico and Arizona},
  author = {R.J. Hackman and A. B. Olson},
  year = {1977},
  doi = {10.3133/i981},
  url = {https://pubs.usgs.gov/publication/i981},
  note = {Source identifier: i981}
}