@misc{indiciae3d9e6c5fd653,
  title = {Analytical results and sample locality map of soil samples from the Rio Vivi porphyry copper district, municipios of Utuado and Adjuntas, Puerto Rico},
  author = {R. E. Learned and H. A. Pierce and Ileana Perez},
  year = {1992},
  doi = {10.3133/ofr93178},
  url = {https://pubs.usgs.gov/publication/ofr93178},
  note = {Source identifier: ofr93178}
}