@misc{indiciae7b74d8388d14,
  title = {Aeromagnetic map of the Gardner quadrangle, Worcester County, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1971},
  doi = {10.3133/gp738},
  url = {https://pubs.usgs.gov/publication/gp738},
  note = {Source identifier: gp738}
}