@misc{indiciae9320547ce039,
  title = {Subsurface cross section showing coal beds in the Sagavanirktok Formation, vicinity of Prudhoe Bay, east-central North Slope, Alaska},
  author = {Stephen B. Roberts},
  year = {1991},
  doi = {10.3133/coal139a},
  url = {https://pubs.usgs.gov/publication/coal139A},
  note = {Source identifier: coal139A}
}