@misc{indiciaec20dcc292e92,
  title = {Geologic and aeromagnetic map of northern Maine},
  author = {A. J. Boucot and Andrew Griscom and John Wing Allingham},
  year = {1964},
  doi = {10.3133/gp312},
  url = {https://pubs.usgs.gov/publication/gp312},
  note = {Source identifier: gp312}
}