@misc{indiciae8333fa30b3d9,
  title = {Maps showing anomalous concentrations of lead, molybdenum, bismuth, and tungsten in stream sediment and heavy-mineral concentrate from parts of the Ajo and Lukeville 1 degree by 2 degrees quadrangles, Arizona},
  author = {P. K. Theobald and H. N. Barton},
  year = {1988},
  doi = {10.3133/mf1834d},
  url = {https://pubs.usgs.gov/publication/mf1834D},
  note = {Source identifier: mf1834D}
}