@misc{indiciaee7b90a2e1a28,
  title = {Calcite mines in northeastern San Diego County, California},
  author = {Cordell Durrel and G.L. Bell},
  year = {1944},
  doi = {10.3133/ofr4477},
  url = {https://pubs.usgs.gov/publication/ofr4477},
  note = {Source identifier: ofr4477}
}