@misc{indiciae5638bd1142f7,
  title = {ORIGIN OF QUARTZ IN COAL.},
  author = {Leslie F. Ruppert and C. Blaine Cecil and Ronald W. Stanton},
  year = {1984},
  url = {https://pubs.usgs.gov/publication/70012790},
  note = {Source identifier: 70012790}
}