@misc{indiciae281e4af0f1a4,
  title = {Cretaceous and lower Tertiary stratigraphy in northwestern Puerto Rico},
  author = {David H. McIntyre and John M. Aaron and Othmar Tardin Tobisch},
  year = {1970},
  doi = {10.3133/b1294d},
  url = {https://pubs.usgs.gov/publication/b1294D},
  note = {Source identifier: b1294D}
}