@misc{indiciaeadc2676850e9,
  title = {Mineral resource assessment of Puerto Rico: Field trip, June 25, 1992},
  author = {R.A. Harris and J. H. Schellekens and G. E. McKelvey and D. P. Cox},
  year = {1992},
  doi = {10.3133/ofr92567},
  url = {https://pubs.usgs.gov/publication/ofr92567},
  note = {Source identifier: ofr92567}
}