@misc{indiciaed3d13a6153ce,
  title = {Aeroradioactivity map of the Hardwick, Massachusetts area},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/ofr76519},
  url = {https://pubs.usgs.gov/publication/ofr76519},
  note = {Source identifier: ofr76519}
}