@misc{indiciae9a936e903a32,
  title = {Manganese-bearing veins in southwestern Virginia},
  author = {Anna I. Jonas},
  year = {1942},
  doi = {10.2113/gsecongeo.37.5.408},
  url = {https://pubs.usgs.gov/publication/70213064},
  note = {Source identifier: 70213064}
}