@misc{indiciaeccaa6420882a,
  title = {Coal geology of the Paleocene-Eocene Calvert Bluff Formation (Wilcox Group) and the Eocene Manning Formation (Jackson Group) in east-central Texas: Field trip guidebook for the Society for Organic Petrology, Twelfth Annual Meeting, The Woodlands, Texas, August 30, 1995},
  author = {Peter D. Warwick and Sharon S. Crowley},
  year = {1995},
  doi = {10.3133/ofr95595},
  url = {https://pubs.usgs.gov/publication/ofr95595},
  note = {Source identifier: ofr95595}
}