@misc{indiciaefd425196124c,
  title = {Variability in results from mineralogical and organic geochemical interlaboratory testing of U. S. Geological Survey shale reference materials},
  author = {Justin E. Birdwell and Stephen A. Wilson},
  year = {2019},
  doi = {10.15530/urtec-2019-457},
  url = {https://pubs.usgs.gov/publication/70206010},
  note = {Source identifier: 70206010}
}