@misc{indiciaecafbac347a55,
  title = {Nineteenth Annual Report of the United States Geological Survey to the Secretary of the Interior 1897 - 1898: Part VI (cont.) - Mineral resources of the United States, 1897, nonmetallic products, except coal and coke},
  author = {Charles D. Walcott and F.H. Oliphant and Edward Wheeler Parker and William C. Day and A. C. Peale and George F. Becker},
  year = {1898},
  doi = {10.3133/ar19\_6c},
  url = {https://pubs.usgs.gov/publication/ar19\_6C},
  note = {Source identifier: ar19\_6C}
}