@misc{indiciae1948d25b475c,
  title = {Contributions to economic geology (short papers and preliminary reports), 1920 : Part II. - Mineral fuels},
  author = {David White and Marius R. Campbell},
  year = {1921},
  doi = {10.3133/b716},
  url = {https://pubs.usgs.gov/publication/b716},
  note = {Source identifier: b716}
}