@misc{indiciae7fe88d027815,
  title = {Preliminary map showing locations of landslides in El Yunque quadrangle, Puerto Rico},
  author = {Manuel R. Guariguata and Matthew C. Larsen},
  year = {1990},
  doi = {10.3133/ofr89257},
  url = {https://pubs.usgs.gov/publication/ofr89257},
  note = {Source identifier: ofr89257}
}