@misc{indiciae656fb481dae0,
  title = {Estimates of Federal ownership of undiscovered oil and gas resources by province; statistical background data for U.S. Geological Survey Circular 860},
  author = {K. L. Varnes and G.L. Dolton},
  year = {1982},
  doi = {10.3133/ofr82666b},
  url = {https://pubs.usgs.gov/publication/ofr82666B},
  note = {Source identifier: ofr82666B}
}