@misc{indiciaea5e02646473f,
  title = {Geology of the Cornwall Quadrangle, Virginia},
  author = {Matthew J. Heller and Mark W. Carter and G.P. Wilkes and R.L. Coiner},
  year = {2019},
  url = {https://pubs.usgs.gov/publication/70203359},
  note = {Source identifier: 70203359}
}