@misc{indiciae4966a20c8fc7,
  title = {Historical statistics for mineral and material commodities in the United States},
  author = {Thomas Kelly and Grecia R. Matos and David A. Buckingham and Carl A. DiFrancesco and Kenneth E. Porter and Cyrus Berry and Melissa Crane and Thomas Goonan and John Sznopek},
  year = {2005},
  doi = {10.3133/ds140},
  url = {https://pubs.usgs.gov/publication/ds140},
  note = {Source identifier: ds140}
}