@misc{indiciae5af4e6c65495,
  title = {A modification of Shapiro's technique for determining low levels of CO 2 in silicate rocks},
  author = {John R. Watterson and Walter H. Ficklin and John Hopkins Turner},
  year = {1976},
  doi = {10.3133/ofr76530},
  url = {https://pubs.usgs.gov/publication/ofr76530},
  note = {Source identifier: ofr76530}
}