@misc{indiciae1183e8fa2605,
  title = {Spectrographic analyses of laterite soil from the Mayaguez area, Puerto Rico},
  author = {Watson Hiner Monroe},
  year = {1956},
  doi = {10.3133/ofr5680},
  url = {https://pubs.usgs.gov/publication/ofr5680},
  note = {Source identifier: ofr5680}
}