@misc{indiciae2579e92ebc70,
  title = {Cassiterite in San Diego County, California},
  author = {W. T. Schaller},
  year = {1916},
  doi = {10.3133/b620p},
  url = {https://pubs.usgs.gov/publication/b620P},
  note = {Source identifier: b620P}
}