@misc{indiciaef0d9f4a6dc9b,
  title = {Physical characteristics of the Tshirege Member of the Bandelier Tuff with reference to use as a building and ornamental stone},
  author = {W.D. Purtymun and F. C. Koopman},
  year = {1965},
  doi = {10.3133/ofr65127},
  url = {https://pubs.usgs.gov/publication/ofr65127},
  note = {Source identifier: ofr65127}
}