@misc{indiciaef7127abe5e95,
  title = {The diffusion of crude petroleum through fuller's earth with notes on its geologic significance},
  author = {Joseph Elliott Gilpin and Oscar Ellis Bransky},
  year = {1911},
  doi = {10.3133/b475},
  url = {https://pubs.usgs.gov/publication/b475},
  note = {Source identifier: b475}
}