@misc{indiciaea3ca60c46cf3,
  title = {Mineral resources of the United States, 1913: Part II - Nonmetals},
  author = {U.S. Geological Survey},
  year = {1914},
  doi = {10.3133/70175807},
  url = {https://pubs.usgs.gov/publication/70175807},
  note = {Source identifier: 70175807}
}