@misc{indiciae9a45d3205f5e,
  title = {Geology and coal resources of T. 6 S., R. 51 W., unsurveyed, Umiat principal meridian, in the Cape Beaufort coal field, northwestern Alaska},
  author = {James E. Callahan},
  year = {1971},
  doi = {10.3133/ofr7161},
  url = {https://pubs.usgs.gov/publication/ofr7161},
  note = {Source identifier: ofr7161}
}