@misc{indiciaeb1ab9c4a7fa6,
  title = {Aeromagnetic map of the Morgantown quadrangle, Berks, Lancaster, and Chester Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1959},
  doi = {10.3133/gp220},
  url = {https://pubs.usgs.gov/publication/gp220},
  note = {Source identifier: gp220}
}