@misc{indiciae4fa0b2af5645,
  title = {Mineral resources of the United States, 1908: Part II - Nonmetallic products},
  author = {U.S. Geological Survey},
  year = {1909},
  doi = {10.3133/70175790},
  url = {https://pubs.usgs.gov/publication/70175790},
  note = {Source identifier: 70175790}
}