@misc{indiciae39831da08cd1,
  title = {Reconnaissance bedrock geologic map of the Sells Quadrangle, Pima County, Arizona},
  author = {D. J. May and Gordon Haxel},
  year = {1980},
  doi = {10.3133/mf1166},
  url = {https://pubs.usgs.gov/publication/mf1166},
  note = {Source identifier: mf1166}
}