@misc{indiciae50188b17c625,
  title = {Geologic map of the Humacao Quadrangle, Puerto Rico},
  author = {J. W. M’Gonigle},
  year = {1978},
  doi = {10.3133/i1070},
  url = {https://pubs.usgs.gov/publication/i1070},
  note = {Source identifier: i1070}
}