@misc{indiciae00b229357feb,
  title = {40Ar/39Ar age-spectrum data for amphibole, muscovite, biotite, and K-feldspar samples from metamorphic rocks in the Blue Ridge anticlinorium, northern Virginia},
  author = {Michael J. Kunk and W.C. Burton},
  year = {1999},
  doi = {10.3133/ofr99552},
  url = {https://pubs.usgs.gov/publication/ofr99552},
  note = {Source identifier: ofr99552}
}