@misc{indiciae0ea6f52383c8,
  title = {Inter-laboratory comparison of X-ray fluorescence analyses of eruptive products of El Chichón Volcano, Chiapas, Mexico},
  author = {Robert I. Tilling and Theodore J. Bornhorst and Joseph E. Taggart and William I. Rose and James J. McGee},
  year = {1987},
  doi = {10.1016/0883-2927(87)90049-7},
  url = {https://pubs.usgs.gov/publication/70014594},
  note = {Source identifier: 70014594}
}