@misc{indiciaefe98e561239b,
  title = {Methane-concentration and methane-isotope data for ground water and soil gas in the Animas River valley, Colorado and New Mexico, 1990-91},
  author = {Daniel T. Chafin and David M. Swanson and David W. Grey},
  year = {1993},
  doi = {10.3133/wri934007\_1993},
  url = {https://pubs.usgs.gov/publication/wri934007\_1993},
  note = {Source identifier: wri934007\_1993}
}