@misc{indiciae41df6bad8067,
  title = {Natural Bitumen Resources of the United States},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2006},
  doi = {10.3133/fs20063133},
  url = {https://pubs.usgs.gov/publication/fs20063133},
  note = {Source identifier: fs20063133}
}