@misc{indiciae421bd3954b45,
  title = {Principal facts for gravity stations in part of the central Virginia Piedmont},
  author = {Stephen L. Snyder and D. L. Daniels and K. R. Bond and J.M. Russell and F. E. Riggle},
  year = {1983},
  doi = {10.3133/ofr8370},
  url = {https://pubs.usgs.gov/publication/ofr8370},
  note = {Source identifier: ofr8370}
}