@misc{indiciae351c85858d2f,
  title = {The determination of 30 elements in geological materials by energy-dispersive X-ray fluorescence spectrometry},
  author = {D. F. Siems},
  year = {2000},
  doi = {10.3133/ofr00475},
  url = {https://pubs.usgs.gov/publication/ofr00475},
  note = {Source identifier: ofr00475}
}