@misc{indiciae76b7d30be615,
  title = {Northeastern United States regional aeromagnetic maps},
  author = {Isidore Zietz and Francis Gilbert and J.R. Kirby},
  year = {1972},
  doi = {10.3133/ofr72459},
  url = {https://pubs.usgs.gov/publication/ofr72459},
  note = {Source identifier: ofr72459}
}