@misc{indiciae3b186f7cd889,
  title = {Aeromagnetic map of part of the Hamburg quadrangle, Sussex County, New Jersey},
  author = {John R. Henderson and Natalie S. Tyson},
  year = {1957},
  doi = {10.3133/gp158},
  url = {https://pubs.usgs.gov/publication/gp158},
  note = {Source identifier: gp158}
}