@misc{indiciae79cebfecd351,
  title = {A regional geochemical reconnaissance, north-central Sonora, Mexico; techniques and analytical data},
  author = {James G. Frisken and Elwin L. Mosier and Robert L. Turner},
  year = {1981},
  doi = {10.3133/ofr81795},
  url = {https://pubs.usgs.gov/publication/ofr81795},
  note = {Source identifier: ofr81795}
}