@misc{indiciae9db4e7da03da,
  title = {Synthetic fuels development: earth-science considerations},
  author = {W.J. Ulman and E. R. Hampton},
  year = {1979},
  doi = {10.3133/70039568},
  url = {https://pubs.usgs.gov/publication/70039568},
  note = {Source identifier: 70039568}
}