@misc{indiciae37e58139cac2,
  title = {Geologic map of the Bayamon Quadrangle, Puerto Rico},
  author = {W. H. Monroe},
  year = {1973},
  doi = {10.3133/i751},
  url = {https://pubs.usgs.gov/publication/i751},
  note = {Source identifier: i751}
}