@misc{indiciaeeb3ac4064c9e,
  title = {Manganese deposits in part of the Sierra Maestra, Cuba},
  author = {Charles Frederick Park and M.W. Cox},
  year = {1944},
  doi = {10.3133/b935f},
  url = {https://pubs.usgs.gov/publication/b935F},
  note = {Source identifier: b935F}
}