@misc{indiciaedc5ebb00acf3,
  title = {Surficial geologic maps and data on three potential offshore sand sources on the insular shelf of Puerto Rico},
  author = {K. A. Grove and J. V. A. Trumbull},
  year = {1978},
  doi = {10.3133/mf1017},
  url = {https://pubs.usgs.gov/publication/mf1017},
  note = {Source identifier: mf1017}
}