@misc{indiciaecfc12652695e,
  title = {Experimental error in sample preparation and spectrographic analysis in the Jiddah laboratory, Saudi Arabia},
  author = {P. K. Theobald and Charles Emmet Thompson},
  year = {1968},
  doi = {10.3133/ofr68267},
  url = {https://pubs.usgs.gov/publication/ofr68267},
  note = {Source identifier: ofr68267}
}