@misc{indiciaef8e291f7f698,
  title = {Maps showing characteristics of the Escollo de Arenas sand and gravel deposit, Vieques Island, Puerto Rico},
  author = {R. W. Rodriguez and Juan L. Trias},
  year = {1989},
  doi = {10.3133/mf2108},
  url = {https://pubs.usgs.gov/publication/mf2108},
  note = {Source identifier: mf2108}
}