@misc{indiciae2aab49e23321,
  title = {Aeromagnetic map of the Glen Rock and part of the New Freedom quadrangles, York County, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1961},
  doi = {10.3133/gp272},
  url = {https://pubs.usgs.gov/publication/gp272},
  note = {Source identifier: gp272}
}