@misc{indiciae9d6db3b20094,
  title = {Report on the geology of the Philippine Islands},
  author = {George F. Becker and K. Martin},
  year = {1901},
  doi = {10.3133/70159131},
  url = {https://pubs.usgs.gov/publication/70159131},
  note = {Source identifier: 70159131}
}