@misc{indiciaef0796dfd7371,
  title = {Bedrock topography of the Connecticut River Valley near Greenfield, Massachusetts},
  author = {Bruce P. Hansen},
  year = {1972},
  doi = {10.3133/ofr72156},
  url = {https://pubs.usgs.gov/publication/ofr72156},
  note = {Source identifier: ofr72156}
}