@misc{indiciae78871f278412,
  title = {Phosphatic shale analytical quality control materials of the USGS Western U.S. Phosphate Project; bulk geochemical characterization and water leachate analysis},
  author = {J. R. Herring and S. A. Wilson},
  year = {2001},
  doi = {10.3133/ofr0124},
  url = {https://pubs.usgs.gov/publication/ofr0124},
  note = {Source identifier: ofr0124}
}