@misc{indiciaee8b6e4c2af42,
  title = {Clay mineralogy of Devonian shales in the Appalachian Basin},
  author = {John W. Hosterman and Sallie I. Whitlow},
  year = {1981},
  doi = {10.3133/ofr81585},
  url = {https://pubs.usgs.gov/publication/ofr81585},
  note = {Source identifier: ofr81585}
}