@misc{indiciae61bdd21cedf5,
  title = {Total-field aeromagnetic map of portions of Penobscot, Piscataquis, and Aroostook Counties, Maine},
  author = {K. R. Bond},
  year = {1993},
  doi = {10.3133/ofr93385a},
  url = {https://pubs.usgs.gov/publication/ofr93385A},
  note = {Source identifier: ofr93385A}
}