@misc{indiciae10acf73515ed,
  title = {Aeromagnetic map of Georgetown and vicinity, east central Texas},
  author = {Gordon E. Andreasen and Frank Petrafeso},
  year = {1962},
  doi = {10.3133/ofr623},
  url = {https://pubs.usgs.gov/publication/ofr623},
  note = {Source identifier: ofr623}
}