@misc{indiciaedb20330fe6c1,
  title = {Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado},
  author = {Peter B. McMahon and Judith C. Thomas and Andrew G. Hunt},
  year = {2013},
  doi = {10.1021/es402473c},
  url = {https://pubs.usgs.gov/publication/70048199},
  note = {Source identifier: 70048199}
}