@misc{indiciae34308da4f397,
  title = {Hydrologic applications of lithofacies clastic-ratio maps},
  author = {Wayne A. Pettyjohn and Phillip G. Randich},
  year = {1967},
  url = {https://pubs.usgs.gov/publication/70196333},
  note = {Source identifier: 70196333}
}