@misc{indiciaeffd087661b33,
  title = {Bedrock geology of the Mount Grace quadrangle, Massachusetts},
  author = {Jarvis B. Hadley},
  year = {1949},
  doi = {10.3133/gq3},
  url = {https://pubs.usgs.gov/publication/gq3},
  note = {Source identifier: gq3}
}