@misc{indiciae462ee52efd12,
  title = {Geology of the middle Tertiary rocks in the Ponce-Guanica area : a progress report},
  author = {Watson Hiner Monroe},
  year = {1972},
  doi = {10.3133/ofr72258},
  url = {https://pubs.usgs.gov/publication/ofr72258},
  note = {Source identifier: ofr72258}
}