@misc{indiciae079aa11227b6,
  title = {Map of bedrock geology of the Orange area, Massachusetts and New Hampshire},
  author = {Peter Robinson},
  year = {1977},
  doi = {10.3133/ofr77788},
  url = {https://pubs.usgs.gov/publication/ofr77788},
  note = {Source identifier: ofr77788}
}