@misc{indiciaec887ec361786,
  title = {X-ray mineralogy of sediments from the southern Black Sea and selected rivers},
  author = {L. J. Poppe and B.J. Hay},
  year = {1993},
  doi = {10.3133/ofr93274},
  url = {https://pubs.usgs.gov/publication/ofr93274},
  note = {Source identifier: ofr93274}
}