@misc{indiciaeff96e1551286,
  title = {A field method for the determination of calcium and magnesium in limestone and dolomite},
  author = {Leonard Shapiro and Walter Wallace Brannock},
  year = {1957},
  doi = {10.3133/ofr5799},
  url = {https://pubs.usgs.gov/publication/ofr5799},
  note = {Source identifier: ofr5799}
}