@misc{indiciaeb8a14660203c,
  title = {Stable isotopes of carbon dioxide in soil gas over massive sulfide mineralization at Crandon, Wisconsin},
  author = {Charles N. Alpers and D. L. Dettman and K.C. Lohmann and D. Brabec},
  year = {1990},
  doi = {10.1016/0375-6742(90)90093-p},
  url = {https://pubs.usgs.gov/publication/70016245},
  note = {Source identifier: 70016245}
}