@misc{indiciae62db1c7cbfe2,
  title = {Mineral commodity summaries 2014},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2014},
  doi = {10.3133/70100414},
  url = {https://pubs.usgs.gov/publication/70100414},
  note = {Source identifier: 70100414}
}