@misc{indiciaeeb2aa902e033,
  title = {Inferences about the origin of oil as indicated by the composition of the organic constituents of sediments},
  author = {P.D. Trask},
  year = {1937},
  doi = {10.3133/pp186h},
  url = {https://pubs.usgs.gov/publication/pp186H},
  note = {Source identifier: pp186H}
}