@misc{indiciae3e76331e75ee,
  title = {Federal and Indian lands coal, phosphate, potash, sodium, and other mineral production, royalty income, and related statistics; 1920 through calendar year 1980},
  author = {U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/25180},
  url = {https://pubs.usgs.gov/publication/25180},
  note = {Source identifier: 25180}
}