@misc{indiciae8645332eab44,
  title = {Aeromagnetic map of part of the Bernville quadrangle, Berks County, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1961},
  doi = {10.3133/gp273},
  url = {https://pubs.usgs.gov/publication/gp273},
  note = {Source identifier: gp273}
}