@misc{indiciae9fc10949ac36,
  title = {Aeromagnetic map of the Mt. Toby quadrangle and part of the Greenfield quadrangle, Franklin and Hampshire Counties, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/gp660},
  url = {https://pubs.usgs.gov/publication/gp660},
  note = {Source identifier: gp660}
}