@misc{indiciae9b21560b330b,
  title = {Aeromagnetic map of part of the Doylestown quadrangle, Bucks and Montgomery Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1960},
  doi = {10.3133/gp263},
  url = {https://pubs.usgs.gov/publication/gp263},
  note = {Source identifier: gp263}
}