@misc{indiciae33136442f895,
  title = {Surficial geologic map of the Ashley Falls quadrangle, Massachusetts-Connecticut},
  author = {George William Holmes and Walter S. Newman},
  year = {1971},
  doi = {10.3133/gq936},
  url = {https://pubs.usgs.gov/publication/gq936},
  note = {Source identifier: gq936}
}