@misc{indiciae33a1b7c5e8e8,
  title = {Aeromagnetic map of Georgetown and vicinity, east-central Texas},
  author = {G. E. Andreasen and F.A. Petrafeso},
  year = {1963},
  doi = {10.3133/gp416},
  url = {https://pubs.usgs.gov/publication/gp416},
  note = {Source identifier: gp416}
}