@misc{indiciaef9066f337d0c,
  title = {Thermal maturity patterns in Pennsylvanian coal-bearing rocks in Alabama, Tennessee, Kentucky, Virginia, West Virginia, Ohio, Maryland, and Pennsylvania},
  author = {Leslie F. Ruppert and Michael H. Trippi and James C. Hower and William C. Grady and Jeffrey R. Levine},
  year = {2014},
  doi = {10.3133/pp1708f.2},
  url = {https://pubs.usgs.gov/publication/pp1708F.2},
  note = {Source identifier: pp1708F.2}
}