@misc{indiciae3d3b2a4f29dc,
  title = {Nineteenth Annual Report of the United States Geological Survey to the Secretary of the Interior 1897 - 1898: Part VI - Mineral Resources of the United States, 1897, Metallic Products, Coal and Coke},
  author = {Charles D. Walcott},
  year = {1898},
  doi = {10.3133/ar19\_6},
  url = {https://pubs.usgs.gov/publication/ar19\_6},
  note = {Source identifier: ar19\_6}
}