@misc{indiciaeeb33edd9b705,
  title = {Heavy oil resources of the United States},
  author = {Bonnie L. Crysdale and Christopher J. Schenk},
  year = {1990},
  doi = {10.3133/b1885},
  url = {https://pubs.usgs.gov/publication/b1885},
  note = {Source identifier: b1885}
}