@misc{indiciae65aba0c73c94,
  title = {Titanium dioxide in pyroclastic layers from volcanoes in the Cascade Range},
  author = {G.K. Czamanske and S.C. Porter},
  year = {1965},
  doi = {10.1126/science.150.3699.1022},
  url = {https://pubs.usgs.gov/publication/70010461},
  note = {Source identifier: 70010461}
}