@misc{indiciaeae898241f961,
  title = {Aeromagnetic map of the Gap quadrangle, Lancaster County, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle and and others},
  year = {1961},
  doi = {10.3133/gp245},
  url = {https://pubs.usgs.gov/publication/gp245},
  note = {Source identifier: gp245}
}