@misc{indiciaeeee51694325b,
  title = {Geologic map of the Ajo and Lukeville 1° by 2° quadrangle, southwest Arizona},
  author = {Floyd Gray and R. J. Miller and M. J. Grubensky and R. M. Tosdal and G. B. Haxel and D. W. Peterson and D. J. May and L. T. Silver},
  year = {1988},
  doi = {10.3133/ofr87347},
  url = {https://pubs.usgs.gov/publication/ofr87347},
  note = {Source identifier: ofr87347}
}