@misc{indiciae95b4e68d54fe,
  title = {Bedrock geology of the Greenfield quadrangle, Massachusetts},
  author = {Max E. Willard},
  year = {1952},
  doi = {10.3133/gq20},
  url = {https://pubs.usgs.gov/publication/gq20},
  note = {Source identifier: gq20}
}