@misc{indiciae546ca9da4f22,
  title = {Geologic map of the Westford quadrangle, Connecticut},
  author = {John D. Peper and Maurice Henry Pease},
  year = {1975},
  doi = {10.3133/gq1214},
  url = {https://pubs.usgs.gov/publication/gq1214},
  note = {Source identifier: gq1214}
}