@misc{indiciaef34fa9eaaa4c,
  title = {Geology and manganese deposits of Guisa-Los Negros area, Oriente Province, Cuba},
  author = {W. P. Woodring and S.N. Daviess},
  year = {1943},
  doi = {10.3133/ofr4349},
  url = {https://pubs.usgs.gov/publication/ofr4349},
  note = {Source identifier: ofr4349}
}