@misc{indiciae63c7c1d11909,
  title = {Manganese deposits of the Ladd-Buckeye area near Tracy, California},
  author = {P.D. Trask and W. G. Pierce},
  year = {1943},
  doi = {10.3133/ofr4345},
  url = {https://pubs.usgs.gov/publication/ofr4345},
  note = {Source identifier: ofr4345}
}