@misc{indiciaedc5af59a7b73,
  title = {Notes on the origin of copromacrinite based on nitrogen functionalities and δ13C and δ15N determined on samples from the Peach Orchard coal bed, southern Magoffin County, Kentucky},
  author = {Bruno Valentim and Manuel Algarra and Alexandra Guedes and Leslie F. Ruppert and James C. Hower},
  year = {2016},
  doi = {10.1016/j.coal.2016.05.004},
  url = {https://pubs.usgs.gov/publication/70154778},
  note = {Source identifier: 70154778}
}