@misc{indiciaee16201526749,
  title = {Puerto Rico; industrial mineral mines, prospects, and occurrences in the Mineral Resources Data System (MRDS)},
  author = {G. J. Orris and Marguerite Carbonaro and M. S. with contributions by Allen and J. D. Bliss and A.H. Ruiz and Richard Kibbe and M.E. Paidakovich and N.J. Page and H. A. Pierce and J. G. Staude},
  year = {1992},
  doi = {10.3133/ofr92244},
  url = {https://pubs.usgs.gov/publication/ofr92244},
  note = {Source identifier: ofr92244}
}