@misc{indiciae36251820e048,
  title = {Manganese in the United States},
  author = {Max D. Crittenden and Louis Pavlides},
  year = {1961},
  doi = {10.3133/ofr6139},
  url = {https://pubs.usgs.gov/publication/ofr6139},
  note = {Source identifier: ofr6139}
}