@misc{indiciae31bf91fcec2f,
  title = {The Conterminous United States Mineral Assessment Program: Background information to accompany folio of geologic, geochemical, geophysical, and mineral resource maps of the Ajo and Lukeville 1° by 2° quadrangles, Arizona},
  author = {Floyd Gray and R. M. Tosdal and J.A. Peterson and D. P. Cox and R. J. Miller and D. P. Klein and P. K. Theobald and G. B. Haxel and M. J. Grubensky and G. L. Raines and H. N. Barton and D.A. Singer and R. G. Eppinger},
  year = {1992},
  doi = {10.3133/cir1082},
  url = {https://pubs.usgs.gov/publication/cir1082},
  note = {Source identifier: cir1082}
}