@misc{indiciaeaf38e48f35c2,
  title = {Preliminary geologic map of the Westford Quadrangle, Windham and Tolland Counties, Connecticut},
  author = {John D. Peper and Maurice Henry Pease},
  year = {1975},
  doi = {10.3133/ofr75439},
  url = {https://pubs.usgs.gov/publication/ofr75439},
  note = {Source identifier: ofr75439}
}