@misc{indiciae15244220279c,
  title = {Digital and preliminary bedrock geologic map of the Wallingford quadrangle, Vermont},
  author = {William C. Burton and Nicholas M. Ratcliffe},
  year = {2000},
  doi = {10.3133/ofr99337b},
  url = {https://pubs.usgs.gov/publication/ofr99337B},
  note = {Source identifier: ofr99337B}
}