@misc{indiciae926866fcda6c,
  title = {Topographic and geologic maps of manganese deposits in California},
  author = {United States Geological Survey},
  year = {1945},
  doi = {10.3133/ofr4573},
  url = {https://pubs.usgs.gov/publication/ofr4573},
  note = {Source identifier: ofr4573}
}