@misc{indiciaeda63c65962a3,
  title = {Manganese deposits of the Lyndhurst-Vesuvius district, Augusta and Rockbridge Counties, Virginia},
  author = {M. M. Knechtel},
  year = {1943},
  doi = {10.3133/ofr4348},
  url = {https://pubs.usgs.gov/publication/ofr4348},
  note = {Source identifier: ofr4348}
}