@misc{indiciae6814b3a9d9d3,
  title = {Manganese deposits of Cedar Creek Valley, Frederick and Shenandoah Counties, Virginia},
  author = {Watson H. Monroe},
  year = {1942},
  doi = {10.3133/ofr4218},
  url = {https://pubs.usgs.gov/publication/ofr4218},
  note = {Source identifier: ofr4218}
}