@misc{indiciae7825b7969ddc,
  title = {Aeromagnetic map of the Conestoga quadrangle, Lancaster County, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1959},
  doi = {10.3133/gp218},
  url = {https://pubs.usgs.gov/publication/gp218},
  note = {Source identifier: gp218}
}