@misc{indiciae5a3ac20a59d2,
  title = {Aeroradioactivity map of the Worcester North and Shrewsbury quadrangles, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/ofr76522},
  url = {https://pubs.usgs.gov/publication/ofr76522},
  note = {Source identifier: ofr76522}
}