@misc{indiciae82cfb59ff3d5,
  title = {Bedrock geology of the Massachusetts portion of the Bernardston quadrangle, Massachusetts-Vermont},
  author = {Robert Balk},
  year = {1956},
  doi = {10.3133/gq90},
  url = {https://pubs.usgs.gov/publication/gq90},
  note = {Source identifier: gq90}
}