@misc{indiciaed91fc9b35ced,
  title = {Use of Ar36 to Evaluate the Incorporation of Air by Ash Flows},
  author = {Richard F. Marvin and H. H. Mehnert and D. C. Noble},
  year = {1970},
  doi = {10.1130/0016-7606(1970)81[3385:uoatet]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70226505},
  note = {Source identifier: 70226505}
}