@misc{indiciae74fe06e2a6b8,
  title = {Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties, California; Part A},
  author = {Gretchen Luepke},
  year = {1994},
  doi = {10.3133/ofr9515},
  url = {https://pubs.usgs.gov/publication/ofr9515},
  note = {Source identifier: ofr9515}
}