@misc{indiciaec6d84b9ba882,
  title = {Geology of the Andover Granite and surrounding rocks, Massachusetts},
  author = {Robert O. Castle},
  year = {1964},
  doi = {10.3133/ofr6433},
  url = {https://pubs.usgs.gov/publication/ofr6433},
  note = {Source identifier: ofr6433}
}