@misc{indiciae677376be29c5,
  title = {Field method for the determination of titanium in rocks},
  author = {Leonard Shapiro and Walter Wallace Brannock},
  year = {1954},
  doi = {10.3133/ofr54283},
  url = {https://pubs.usgs.gov/publication/ofr54283},
  note = {Source identifier: ofr54283}
}