@misc{indiciae2c04e624a836,
  title = {Origin of the copper deposits of the Ducktown type in the southern Appalachian region},
  author = {C. S. Ross},
  year = {1935},
  doi = {10.3133/pp179},
  url = {https://pubs.usgs.gov/publication/pp179},
  note = {Source identifier: pp179}
}