@misc{indiciae238d6e1b5cee,
  title = {Preliminary report on the coal resources of the National Petroleum Reserve in Alaska},
  author = {G. C. Martin and James E. Callahan},
  year = {1978},
  doi = {10.3133/ofr781033},
  url = {https://pubs.usgs.gov/publication/ofr781033},
  note = {Source identifier: ofr781033}
}