@misc{indiciae08006b08a6fb,
  title = {Aeromagnetic map of the Wilmington, Delaware area and adjacent parts of Pennsylvania and Maryland},
  author = {J. R. Henderson and R.W. Johnson and F. P. Gilbert},
  year = {1963},
  doi = {10.3133/gp363},
  url = {https://pubs.usgs.gov/publication/gp363},
  note = {Source identifier: gp363}
}