@misc{indiciaec1400376841e,
  title = {The distribution of minor elements in samples of biotite from igneous rocks - basic data},
  author = {T.G. Lovering},
  year = {1969},
  doi = {10.3133/ofr69152},
  url = {https://pubs.usgs.gov/publication/ofr69152},
  note = {Source identifier: ofr69152}
}