@misc{indiciae3678f0796665,
  title = {Clinoptilolite of possible economic value in sedimentary deposits of the conterminous United States},
  author = {Richard A. Sheppard},
  year = {1971},
  doi = {10.3133/b1332b},
  url = {https://pubs.usgs.gov/publication/b1332B},
  note = {Source identifier: b1332B}
}