@misc{indiciaeab37ad4c9b87,
  title = {Geology of the Vega Alta quadrangle, Puerto Rico},
  author = {Watson Hiner Monroe},
  year = {1963},
  doi = {10.3133/gq191},
  url = {https://pubs.usgs.gov/publication/gq191},
  note = {Source identifier: gq191}
}