@misc{indiciae7b7b23d68368,
  title = {Preliminary materials map, Pittsfield East quadrangle, Massachusetts},
  author = {George William Holmes},
  year = {1968},
  doi = {10.3133/ofr68134},
  url = {https://pubs.usgs.gov/publication/ofr68134},
  note = {Source identifier: ofr68134}
}