@misc{indiciae9e723341cb14,
  title = {Aeromagnetic map of the Phoenixville quadrangle, Chester and Montgomery Counties, Pennsylvania},
  author = {Randolph Wilson Bromery and B. L. Bennett},
  year = {1959},
  doi = {10.3133/gp209},
  url = {https://pubs.usgs.gov/publication/gp209},
  note = {Source identifier: gp209}
}