@misc{indiciae13bc8ca4bfe0,
  title = {Topographic and geologic map of the Knob Creek area of the Wishbone Hill district, Matanuska coal field, Alaska},
  author = {Farrell F. Barnes},
  year = {1962},
  doi = {10.3133/coal51},
  url = {https://pubs.usgs.gov/publication/coal51},
  note = {Source identifier: coal51}
}