@misc{indiciaecaef1c56acba,
  title = {Rapid analysis of silicate rocks},
  author = {Leonard Shapiro and Walter Wallace Brannock},
  year = {1952},
  doi = {10.3133/cir165},
  url = {https://pubs.usgs.gov/publication/cir165},
  note = {Source identifier: cir165}
}