@misc{indiciaeb6508081ebd4,
  title = {Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California},
  author = {J.P. Calzia},
  year = {1988},
  doi = {10.3133/mf1999},
  url = {https://pubs.usgs.gov/publication/mf1999},
  note = {Source identifier: mf1999}
}