@misc{indiciaea351067c759e,
  title = {Geochemical maps of the Pusch Ridge Wilderness Area, Pima County, Arizona},
  author = {M. E. Hinkle},
  year = {1981},
  doi = {10.3133/mf1356a},
  url = {https://pubs.usgs.gov/publication/mf1356A},
  note = {Source identifier: mf1356A}
}