@misc{indiciae3e5357bd95df,
  title = {Contributions to economic geology (short papers and preliminary reports) 1909: Part II - Mineral fuels},
  author = {Marius Robinson Campbell},
  year = {1911},
  doi = {10.3133/b431},
  url = {https://pubs.usgs.gov/publication/b431},
  note = {Source identifier: b431}
}