@misc{indiciaebc784ea3fcbc,
  title = {Clay mineralogy of sediments from the Rio Cibuco system and the adjacent rivers and insular shelf of north-central Puerto Rico},
  author = {Lawrence J. Poppe and Judith A. Commeau and Gretchen Luepke},
  year = {1991},
  doi = {10.3133/ofr91628},
  url = {https://pubs.usgs.gov/publication/ofr91628},
  note = {Source identifier: ofr91628}
}