@misc{indiciaec30c6d3479ba,
  title = {Ionic method of geophysical prospecting},
  author = {E.A. Sergeev and A.P. Solovov and H. E. Hawkes},
  year = {1937},
  doi = {10.3133/ofr4821e},
  url = {https://pubs.usgs.gov/publication/ofr4821E},
  note = {Source identifier: ofr4821E}
}