@misc{indiciae36d2cfac210c,
  title = {Stratigraphy and chemical analyses of coal beds in the Upper Cretaceous and Tertiary Sagavanirktok Formation, east-central North Slope, Alaska},
  author = {Stephen B. Roberts and Gary D. Stricker and Ronald H. Affolter},
  year = {1991},
  doi = {10.3133/coal139b},
  url = {https://pubs.usgs.gov/publication/coal139B},
  note = {Source identifier: coal139B}
}