@misc{indiciae8e4d8a6d54df,
  title = {Bedrock geologic map of the Gloucester and Rockport quadrangles, Essex County, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1992},
  doi = {10.3133/i2285},
  url = {https://pubs.usgs.gov/publication/i2285},
  note = {Source identifier: i2285}
}