@misc{indiciae6b4ee36e7f03,
  title = {Preliminary bedrock geological map of the Warren quadrangle, Worcester, Hampden, and Hampshire Counties, Massachusetts},
  author = {John S. Pomeroy},
  year = {1973},
  doi = {10.3133/ofr73226},
  url = {https://pubs.usgs.gov/publication/ofr73226},
  note = {Source identifier: ofr73226}
}