@misc{indiciaed5d5c0d449c1,
  title = {Manganese deposits of Cedar Creek Valley, Frederick and Shenandoah Counties, Virginia},
  author = {W. H. Monroe},
  year = {1942},
  doi = {10.3133/b936e},
  url = {https://pubs.usgs.gov/publication/b936E},
  note = {Source identifier: b936E}
}