@misc{indiciae6da77a3c4f76,
  title = {Hornblende-plagioclase porphyry intrusives in the northeast quarter of the Ponce quadrangle, Puerto Rico},
  author = {R.D. Krushensky},
  year = {1971},
  doi = {10.3133/ofr71176},
  url = {https://pubs.usgs.gov/publication/ofr71176},
  note = {Source identifier: ofr71176}
}