@misc{indiciaeb741bfaacca1,
  title = {Mineral resources of the Jacumba (In-ko-pah) Wilderness Study Area, Imperial County, California},
  author = {Victoria R. Todd and J.E. Kilburn and D.E. Detra and Andrew Griscom and F.A. Kruse and E.L. McHugh},
  year = {1987},
  doi = {10.3133/b1711d},
  url = {https://pubs.usgs.gov/publication/b1711D},
  note = {Source identifier: b1711D}
}