@misc{indiciae08cfe930d56b,
  title = {Characterization of the Helderberg Group as a geologic seal for CO 2 sequestration},
  author = {J.E. Lewis and R.R. McDowell and K.L. Avary and K.M. Carter},
  year = {2009},
  doi = {10.1306/eg.04080909003},
  url = {https://pubs.usgs.gov/publication/70035404},
  note = {Source identifier: 70035404}
}