@misc{indiciae39b24f942989,
  title = {Unconventional shallow biogenic gas systems},
  author = {G. W. Shurr and J.L. Ridgley},
  year = {2002},
  doi = {10.1306/61eeddc8-173e-11d7-8645000102c1865d},
  url = {https://pubs.usgs.gov/publication/70024183},
  note = {Source identifier: 70024183}
}