@misc{indiciaedc2670c0667a,
  title = {Mineral resources of the Kofa Unit 4 North Wilderness Study Area, Yuma County, Arizona},
  author = {David R. Sherrod and D. B. Smith and M. D. Kleinkopf and D. D. Gese},
  year = {1990},
  doi = {10.3133/b1702k},
  url = {https://pubs.usgs.gov/publication/b1702K},
  note = {Source identifier: b1702K}
}