@misc{indiciae45e8981fe5ec,
  title = {Map of assessed coalbed-gas resources in the United States, 2014},
  author = {U.S. Geological Survey National Assessment of Oil and Gas Resources Team and Laura R. H. Biewick},
  year = {2014},
  doi = {10.3133/ds69ii},
  url = {https://pubs.usgs.gov/publication/ds69II},
  note = {Source identifier: ds69II}
}