@misc{indiciae74287157d67d,
  title = {Aeromagnetic map of part of the Lumberville quadrangle, Bucks County, Pennsylvania, and Hunterdon County, New Jersey},
  author = {Randolph Wilson Bromery and G. L. Zandle and and others},
  year = {1960},
  doi = {10.3133/gp261},
  url = {https://pubs.usgs.gov/publication/gp261},
  note = {Source identifier: gp261}
}