@misc{indiciaec11b5a5a7089,
  title = {Aeromagnetic survey of the Katahdin area, Maine},
  author = {James R. Balsley},
  year = {1951},
  doi = {10.3133/ofr5153},
  url = {https://pubs.usgs.gov/publication/ofr5153},
  note = {Source identifier: ofr5153}
}