@misc{indiciae171f2b74f622,
  title = {Aeromagnetic map of the East Greenville quadrangle, Berks, Lehigh, and Montgomery Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1959},
  doi = {10.3133/gp205},
  url = {https://pubs.usgs.gov/publication/gp205},
  note = {Source identifier: gp205}
}