@misc{indiciae1401308f533d,
  title = {Mineralogy, chemistry, gas adsorption, and NH4 exchange capacity for selected zeolitic tuffs from the Western United States},
  author = {R.A. Sheppard and A. J. Gude},
  year = {1982},
  doi = {10.3133/ofr82969},
  url = {https://pubs.usgs.gov/publication/ofr82969},
  note = {Source identifier: ofr82969}
}