@misc{indiciaef826c7c303dc,
  title = {Contributions to economic geology (short papers and preliminary reports) 1911: Part II - mineral fuels},
  author = {Marius Robinson Campbell},
  year = {1913},
  doi = {10.3133/b531},
  url = {https://pubs.usgs.gov/publication/b531},
  note = {Source identifier: b531}
}