@misc{indiciae02772f3bb95b,
  title = {Aeromagnetic map of the Safe Harbor quadrangle, Lancaster and York Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1959},
  doi = {10.3133/gp217},
  url = {https://pubs.usgs.gov/publication/gp217},
  note = {Source identifier: gp217}
}