@misc{indiciae03047fda1eb4,
  title = {Geology of the Yauco and Punta Verraco quadrangles, Puerto Rico},
  author = {R.D. Krushensky and Watson Hiner Monroe},
  year = {1977},
  doi = {10.3133/ofr77178},
  url = {https://pubs.usgs.gov/publication/ofr77178},
  note = {Source identifier: ofr77178}
}