@misc{indiciae2f0627d6f2ba,
  title = {Rapid analysis of silicate, carbonate, and phosphate rocks: Revised edition},
  author = {Leonard Shapiro},
  year = {1975},
  doi = {10.3133/b1401},
  url = {https://pubs.usgs.gov/publication/b1401},
  note = {Source identifier: b1401}
}