@misc{indiciaec9b236f8f895,
  title = {Mineral Commodity Summaries 2008},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2008},
  doi = {10.3133/mineral2008},
  url = {https://pubs.usgs.gov/publication/mineral2008},
  note = {Source identifier: mineral2008}
}