@misc{indiciae38153467c9a9,
  title = {Principal facts for gravity stations in Fairfax County, Virginia},
  author = {David L. Daniels and T.L. Heironimus},
  year = {1980},
  doi = {10.3133/ofr80786},
  url = {https://pubs.usgs.gov/publication/ofr80786},
  note = {Source identifier: ofr80786}
}