@misc{indiciaef864d582cab1,
  title = {Map showing depth to bedrock, Heath quadrangle, Massachusetts-Vermont},
  author = {C.J. Londquist},
  year = {1975},
  doi = {10.3133/mf663a},
  url = {https://pubs.usgs.gov/publication/mf663A},
  note = {Source identifier: mf663A}
}