@misc{indiciaefd1283cb6b37,
  title = {Map showing depth to bedrock, Shelburne Falls Quadrangle, Massachusetts},
  author = {C.J. Londquist},
  year = {1974},
  doi = {10.3133/mf591a},
  url = {https://pubs.usgs.gov/publication/mf591A},
  note = {Source identifier: mf591A}
}