@misc{indiciae7e24645ebc7c,
  title = {Map showing depth to bedrock, Worthington Quadrangle, Massachusetts},
  author = {C.J. Londquist},
  year = {1975},
  doi = {10.3133/mf662a},
  url = {https://pubs.usgs.gov/publication/mf662A},
  note = {Source identifier: mf662A}
}