@misc{indiciaec67d57507307,
  title = {Mineral resources of the United States, 1914: Part II - Nonmetals},
  author = {Hiram Dryer McCaskey and Ernest Francis Burchard},
  year = {1916},
  doi = {10.3133/70175810},
  url = {https://pubs.usgs.gov/publication/70175810},
  note = {Source identifier: 70175810}
}