@misc{indiciae2b403d4afd18,
  title = {Fluorine content of 15 USGS reference samples by selective ion electrode},
  author = {Debby Kay},
  year = {1984},
  doi = {10.3133/ofr8723},
  url = {https://pubs.usgs.gov/publication/ofr8723},
  note = {Source identifier: ofr8723}
}