@misc{indiciae8aff63d6b5d0,
  title = {Surficial geologic map of the Georgetown quadrangle, Essex County, Massachusetts},
  author = {Norman P. Cuppels},
  year = {1969},
  doi = {10.3133/gq850},
  url = {https://pubs.usgs.gov/publication/gq850},
  note = {Source identifier: gq850}
}