@misc{indiciae4cc38764421f,
  title = {Stratigraphy and conodont biostratigraphy of the uppermost Carboniferous and Lower Permian from the North American Midcontinent},
  author = {Darwin R. Boardman and Bruce R. Wardlaw and Merlynd K. Nestell},
  year = {2009},
  url = {https://pubs.usgs.gov/publication/70003457},
  note = {Source identifier: 70003457}
}