@misc{indiciae8ee693cb81d2,
  title = {Stratigraphy of Pennsylvanian and lower Permian rocks in Brown and Coleman Counties, Texas},
  author = {D. H. Eargle},
  year = {1960},
  doi = {10.3133/pp315d},
  url = {https://pubs.usgs.gov/publication/pp315D},
  note = {Source identifier: pp315D}
}