@misc{indiciae793cfdf5b8bf,
  title = {The electrical properties of clay},
  author = {W.R. Sill and James David Klein},
  year = {1981},
  doi = {10.3133/ofr81989},
  url = {https://pubs.usgs.gov/publication/ofr81989},
  note = {Source identifier: ofr81989}
}