@misc{indiciae363976f3d8cc,
  title = {Map showing depth to bedrock, Chester Quadrangle, Massachusetts},
  author = {C.J. Londquist},
  year = {1975},
  doi = {10.3133/mf667a},
  url = {https://pubs.usgs.gov/publication/mf667A},
  note = {Source identifier: mf667A}
}