@misc{indiciae91e5e6e7d791,
  title = {Program MARQLOOPS: Marquardt inversion of loop-loop frequency soundings},
  author = {Walter L. Anderson},
  year = {1979},
  doi = {10.3133/ofr79240},
  url = {https://pubs.usgs.gov/publication/ofr79240},
  note = {Source identifier: ofr79240}
}