@misc{indiciae13c0979b1979,
  title = {Special technical facilities at the National Bureau of Standards},
  author = {Henry Lea Mason and Iris M. Lloyd},
  year = {1976},
  doi = {10.3133/25347},
  url = {https://pubs.usgs.gov/publication/25347},
  note = {Source identifier: 25347}
}