@misc{indiciae6b0a2cc2794f,
  title = {Relation between the crystal content and the chemical composition of welded tuffs},
  author = {Donald W. Peterson and Ralph Jackson Roberts},
  year = {1963},
  doi = {10.1007/bf02597280},
  url = {https://pubs.usgs.gov/publication/70221061},
  note = {Source identifier: 70221061}
}