@misc{indiciaef6696c86f4e7,
  title = {Middle Eocene intrusive igneous rocks of the central Appalachian Valley and Ridge province - Setting, chemistry, and implications for crustal structure},
  author = {C. Scott Southworth and Karen J. Gray and John F. Sutter},
  year = {1993},
  doi = {10.3133/b1839j},
  url = {https://pubs.usgs.gov/publication/b1839J},
  note = {Source identifier: b1839J}
}