@misc{indiciae7781ee5be0d2,
  title = {Stable Carbon Isotopes of HCO3 in the Aquia Aquifer, Maryland: Evidence for an Isotopically Heavy Source of CO2},
  author = {Francis H. Chapelle and LeRoy L. Knobel},
  year = {2006},
  doi = {10.1111/j.1745-6584.1985.tb01507.x},
  url = {https://pubs.usgs.gov/publication/70012986},
  note = {Source identifier: 70012986}
}