@misc{indiciae009aecd39af4,
  title = {A semiquantitative spectrographic method for the analysis of minerals, rocks, and ores},
  author = {C. L. Waring and C. S. Annell},
  year = {1951},
  doi = {10.3133/tei143},
  url = {https://pubs.usgs.gov/publication/tei143},
  note = {Source identifier: tei143}
}