@misc{indiciaea29fef2a2cc0,
  title = {Aeromagnetic map of part of the Ambler quadrangle, Montgomery and Bucks Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and G. L. Zandle},
  year = {1960},
  doi = {10.3133/gp265},
  url = {https://pubs.usgs.gov/publication/gp265},
  note = {Source identifier: gp265}
}