@misc{indiciaeb710742a0435,
  title = {Origin of manganese deposits of Busuanga Island, Philippines},
  author = {Ronald Keith Sorem},
  year = {1958},
  doi = {10.3133/ofr5898},
  url = {https://pubs.usgs.gov/publication/ofr5898},
  note = {Source identifier: ofr5898}
}