@misc{indiciae4e490ad5203f,
  title = {Correlation of Devonian rock units in the Appalachian Basin},
  author = {William Albert Oliver and Wallace De Witt and J.M. Dennison and D.M. Hoskins and J. W. Huddle},
  year = {1969},
  doi = {10.3133/oc64},
  url = {https://pubs.usgs.gov/publication/oc64},
  note = {Source identifier: oc64}
}