@misc{indiciaeafeb9ee70d08,
  title = {Titanium analyses of black sands from six beaches, San Francisco and San Mateo counties, California},
  author = {Gretchen Luepke and J.J. Consul},
  year = {1987},
  doi = {10.3133/ofr87483},
  url = {https://pubs.usgs.gov/publication/ofr87483},
  note = {Source identifier: ofr87483}
}