@misc{indiciaef3ea2e5f4853,
  title = {Reported industrial minerals occurrences and permissive areas for other occurrences in the Islamic Republic of Mauritania, (phase V, deliverable 89)},
  author = {William H. Langer},
  year = {2015},
  doi = {10.3133/ofr20131280r},
  url = {https://pubs.usgs.gov/publication/ofr20131280R},
  note = {Source identifier: ofr20131280R}
}