@misc{indiciae1b22d02f94aa,
  title = {Iron ores, fuels, and fluxes of the Birmingham district, Alabama, with chapters on the origin of the ores},
  author = {Ernest Francis Burchard and Charles Butts and Edwin C. Eckel},
  year = {1910},
  doi = {10.3133/b400},
  url = {https://pubs.usgs.gov/publication/b400},
  note = {Source identifier: b400}
}