@misc{indiciae45b8bd0d167c,
  title = {Preliminary geologic maps of Newburyport West and East quadrangles, Massachusetts-New Hampshire},
  author = {Andrew Fletcher Shride},
  year = {1976},
  doi = {10.3133/ofr76488},
  url = {https://pubs.usgs.gov/publication/ofr76488},
  note = {Source identifier: ofr76488}
}