@misc{indiciae274663ee86a6,
  title = {Chemistry of igneous rocks; Part 1, The chemistry of the peralkaline oversaturated obsidians},
  author = {Ray MacDonald and D.K. Bailey},
  year = {1972},
  doi = {10.3133/pp440n1},
  url = {https://pubs.usgs.gov/publication/pp440N1},
  note = {Source identifier: pp440N1}
}