@misc{indiciae2984311a04a9,
  title = {Evidence for the correlation of the upper part of the Llewellyn Formation (Pennsylvania Anthracite region), with the Monongahela Formation},
  author = {J.R. Eggleston and C. Wnuk and W.E. Edmunds},
  year = {1996},
  url = {https://pubs.usgs.gov/publication/70017834},
  note = {Source identifier: 70017834}
}