@misc{indiciae2627aa627aae,
  title = {Three USGS mafic rock references samples, W-2, DNC-1, and BIR-1},
  author = {F.J. Flanagan},
  year = {1984},
  doi = {10.3133/b1623},
  url = {https://pubs.usgs.gov/publication/b1623},
  note = {Source identifier: b1623}
}