@misc{indiciaeed70c6843e44,
  title = {The Pennsylvanian Fire Clay tonstein of the Appalachian basin—Its distribution, biostratigraphy, and mineralogy: Discussion and reply},
  author = {William Outerbridge and C. L. Rice and Harvey E. Belkin and T.W. Henry and Michael J. Kunk},
  year = {1995},
  doi = {10.1130/0016-7606(1996)108<0120:tpfcto>2.3.co;2},
  url = {https://pubs.usgs.gov/publication/70207654},
  note = {Source identifier: 70207654}
}