@misc{indiciae2aa9727228b2,
  title = {Unusual, high-temperature, iron-rich, mineral phases produced by natural burning of coal seams; analytical data},
  author = {J. R. Herring and P.J. Modreski},
  year = {1986},
  doi = {10.3133/ofr8722},
  url = {https://pubs.usgs.gov/publication/ofr8722},
  note = {Source identifier: ofr8722}
}