@misc{indiciaecf01a46494a3,
  title = {Stable isotope compositions of gases and vegetation near naturally burning coal},
  author = {J.D. Gleason and T.K. Kyser},
  year = {1984},
  doi = {10.1038/307254a0},
  url = {https://pubs.usgs.gov/publication/70013417},
  note = {Source identifier: 70013417}
}