@misc{indiciaefee24dca7db1,
  title = {Chemical composition of sandstones, excluding carbonate and volcanic sands},
  author = {F.J. Pettijohn},
  year = {1963},
  doi = {10.3133/pp440s},
  url = {https://pubs.usgs.gov/publication/pp440S},
  note = {Source identifier: pp440S}
}