@misc{indiciaed81654f2ede3,
  title = {Contributions to economic geology (short papers and preliminary reports), 1923-1924: Part II. - Mineral fuels},
  author = {K. C. Heald and W. T. Thom},
  year = {1925},
  doi = {10.3133/b751},
  url = {https://pubs.usgs.gov/publication/b751},
  note = {Source identifier: b751}
}