@misc{indiciaecb188761853a,
  title = {Aeromagnetic maps of part of the Gulf of Mexico},
  author = {James R. Balsley},
  year = {1949},
  doi = {10.3133/ofr4912},
  url = {https://pubs.usgs.gov/publication/ofr4912},
  note = {Source identifier: ofr4912}
}