@misc{indiciae9037b18053f6,
  title = {Geologic map of the Moca and Isabela quadrangles, Puerto Rico},
  author = {W. H. Monroe},
  year = {1969},
  doi = {10.3133/i565},
  url = {https://pubs.usgs.gov/publication/i565},
  note = {Source identifier: i565}
}