@misc{indiciae89a26f3b3c00,
  title = {A field method for making a quantitative estimate of altered tuff in sandstone},
  author = {R. A. Cadigan},
  year = {1954},
  doi = {10.3133/tei174},
  url = {https://pubs.usgs.gov/publication/tei174},
  note = {Source identifier: tei174}
}