@misc{indiciae4c05d4cb8fb6,
  title = {Geology and manganese deposits of Guisa-Los Negros area, Oriente Province, Cuba},
  author = {W. P. Woodring and Steven Norman Daviess},
  year = {1944},
  doi = {10.3133/b935g},
  url = {https://pubs.usgs.gov/publication/b935G},
  note = {Source identifier: b935G}
}