@misc{indiciae3a08b9776701,
  title = {Maps showing nonmetallic mineral deposits in the Phoenix area, Arizona},
  author = {R. T. Moore and R. J. Varga},
  year = {1976},
  doi = {10.3133/i845j},
  url = {https://pubs.usgs.gov/publication/i845J},
  note = {Source identifier: i845J}
}