@misc{indiciae344393ce9fad,
  title = {Manganiferous and ferruginous chert in Perry and Lewis Counties, Tennessee},
  author = {Ernest Francis Burchard and Hiram S. Rankin},
  year = {1943},
  doi = {10.3133/b928d},
  url = {https://pubs.usgs.gov/publication/b928D},
  note = {Source identifier: b928D}
}