@misc{indiciae55b19ed996c3,
  title = {Iron ore in Cass, Marion, Morris, and Cherokee Counties, Texas},
  author = {E. F. Burchard},
  year = {1916},
  doi = {10.3133/b620e},
  url = {https://pubs.usgs.gov/publication/b620E},
  note = {Source identifier: b620E}
}