@misc{indiciae3e6848fc1e63,
  title = {Semi-quantitative ion microprobe mass analyses of mineral-rich particles from the upper freeport coal},
  author = {R. B. Finkelman and D.S. Simons and F.T. Dulong and E.B. Steel},
  year = {1984},
  doi = {10.1016/0166-5162(84)90021-1},
  url = {https://pubs.usgs.gov/publication/70013196},
  note = {Source identifier: 70013196}
}