@misc{indiciaea1bf26593f11,
  title = {Energy resources map of Colorado},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/i1039},
  url = {https://pubs.usgs.gov/publication/i1039},
  note = {Source identifier: i1039}
}