@misc{indiciae76d3018f738d,
  title = {Aeromagnetic map of the Milford Square quadrangle, Bucks, Lehigh, and Montgomery Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1959},
  doi = {10.3133/gp206},
  url = {https://pubs.usgs.gov/publication/gp206},
  note = {Source identifier: gp206}
}