@misc{indiciae078dea7b5e1c,
  title = {Preliminary map of bedrock surface under parts of Boston, Cambridge, and Brookline, Massachusetts},
  author = {Clifford A. Kaye},
  year = {1970},
  doi = {10.3133/ofr70178},
  url = {https://pubs.usgs.gov/publication/ofr70178},
  note = {Source identifier: ofr70178}
}