@misc{indiciaefeb15f467c17,
  title = {Chemical analyses of rocks and glass separates from Crater Lake National Park and vicinity, Oregon},
  author = {P. E. Bruggman and C. R. Bacon and P. J. Aruscavage and R.W. Lerner and L.J. Schwarz and K. C. Stewart},
  year = {1987},
  doi = {10.3133/ofr8757},
  url = {https://pubs.usgs.gov/publication/ofr8757},
  note = {Source identifier: ofr8757}
}