@misc{indiciaefae487bada50,
  title = {Contributions to economic geology (short papers and preliminary reports), 1913: Part II - mineral fuels},
  author = {Marius Robinson Campbell and David White},
  year = {1915},
  doi = {10.3133/b581},
  url = {https://pubs.usgs.gov/publication/b581},
  note = {Source identifier: b581}
}