@misc{indiciae94de940c8419,
  title = {Aeromagnetic map of the Ephrata quadrangle, Lancaster County, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1961},
  doi = {10.3133/gp241},
  url = {https://pubs.usgs.gov/publication/gp241},
  note = {Source identifier: gp241}
}