@misc{indiciae0a1d8a1bf1a1,
  title = {Improved method for measuring counting times with the Norelco x-ray diffraction spectrometer},
  author = {C. L. Christ},
  year = {1951},
  url = {https://pubs.usgs.gov/publication/70011172},
  note = {Source identifier: 70011172}
}