@misc{indiciae153d684fff61,
  title = {Semiquantitative spectrographic method for analysis of minerals, rocks, and ores},
  author = {C. L. Waring and C. S. Annell},
  year = {2002},
  doi = {10.1021/ac60080a008},
  url = {https://pubs.usgs.gov/publication/70011071},
  note = {Source identifier: 70011071}
}