@misc{indiciae463a2760b814,
  title = {Mineral commodity summaries 2013},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2013},
  doi = {10.3133/mineral2013},
  url = {https://pubs.usgs.gov/publication/mineral2013},
  note = {Source identifier: mineral2013}
}