@misc{indiciae984325121aa0,
  title = {Phosphates in some Missouri refractory clays},
  author = {Robert B. Halley and Eugene E. Foord and David J. Keller and Walter D. Keller},
  year = {2024},
  doi = {10.1346/ccmn.1997.0450306},
  url = {https://pubs.usgs.gov/publication/70019210},
  note = {Source identifier: 70019210}
}