@misc{indiciae45cdca1dce13,
  title = {A comparison of upper mantle subcontinental electrical conductivity for North America, Europe, and Asia.},
  author = {W.H. Campbell and E.R. Schiffmacher},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70014622},
  note = {Source identifier: 70014622}
}