@misc{indiciae1e07df2aaa79,
  title = {Structure of the crust in the conterminous United States},
  author = {David H. Warren and J. H. Healy},
  year = {1973},
  doi = {10.1016/0040-1951(73)90108-x},
  url = {https://pubs.usgs.gov/publication/70010020},
  note = {Source identifier: 70010020}
}