@misc{indiciaecb6698c223c5,
  title = {Preliminary report on electromagnetic model studies},
  author = {F.C. Frischknecht and G. B. Mangan},
  year = {1960},
  doi = {10.3133/ofr6053},
  url = {https://pubs.usgs.gov/publication/ofr6053},
  note = {Source identifier: ofr6053}
}