@misc{indiciaef58c0c0c766b,
  title = {Contributions to economic geology (short papers and preliminary reports), 1922: Part II. - Mineral fuels},
  author = {K. C. Heald},
  year = {1923},
  doi = {10.3133/b736},
  url = {https://pubs.usgs.gov/publication/b736},
  note = {Source identifier: b736}
}