@misc{indiciae85a440e5e890,
  title = {Map showing depth to bedrock, Greenfield Quadrangle, Massachusetts},
  author = {C.J. Londquist},
  year = {1975},
  doi = {10.3133/mf629b},
  url = {https://pubs.usgs.gov/publication/mf629B},
  note = {Source identifier: mf629B}
}