@misc{indiciae056de74421c4,
  title = {Preliminary bedrock geologic map of the Georgetown Quadrangle, Essex County, Massachusetts},
  author = {Kenneth Granville Bell and A. F. Shride and Norman P. Cuppels},
  year = {1977},
  doi = {10.3133/ofr77179},
  url = {https://pubs.usgs.gov/publication/ofr77179},
  note = {Source identifier: ofr77179}
}