@misc{indiciaee9a924e61031,
  title = {Map showing depth to bedrock, Warren Quadrangle, Massachusetts},
  author = {C.J. Londquist and J. S. Pomeroy},
  year = {1974},
  doi = {10.3133/mf541d},
  url = {https://pubs.usgs.gov/publication/mf541D},
  note = {Source identifier: mf541D}
}