@misc{indiciae159e1eeb5f89,
  title = {Geologic map of the Massachusetts portion of the Northfield quadrangle, Massachusetts, New Hampshire, and Vermont: Bedrock geology},
  author = {Robert Balk},
  year = {1956},
  doi = {10.3133/gq92},
  url = {https://pubs.usgs.gov/publication/gq92},
  note = {Source identifier: gq92}
}