@misc{indiciae344541cbd08b,
  title = {Depositional controls, distribution, and effectiveness of world's petroleum source rocks},
  author = {Gregory F. Ulmishek and H. Douglas Klemme},
  year = {1990},
  doi = {10.3133/b1931},
  url = {https://pubs.usgs.gov/publication/b1931},
  note = {Source identifier: b1931}
}