@misc{indiciae09a9bb91e845,
  title = {Mineral Resources Data System (MRDS)},
  author = {G.T. Mason and R.E. Arndt},
  year = {1996},
  doi = {10.3133/ds20},
  url = {https://pubs.usgs.gov/publication/ds20},
  note = {Source identifier: ds20}
}