@misc{indiciaeb4bfc1f57e03,
  title = {An x-ray diffraction method for semiquantitative mineralogical analysis of chilean nitrate ore},
  author = {C. John and J. George and E. Ericksen},
  year = {1997},
  url = {https://pubs.usgs.gov/publication/70019371},
  note = {Source identifier: 70019371}
}