@misc{indiciae851c6593963d,
  title = {Distribution of minor elements in some coals in the Western and Southwestern regions of the Interior coal province},
  author = {Peter Zubovic and Nola B. Sheffey and Taisia Maximovna Stadnichenko},
  year = {1967},
  doi = {10.3133/b1117d},
  url = {https://pubs.usgs.gov/publication/b1117D},
  note = {Source identifier: b1117D}
}