@misc{1154076,
  author = {Natsuko Hironaka},
  title = {The use of National Bureau of Standards high frequency broadcasts for time and frequency calibrations:},
  year = {1975},
  month = {1975-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.668},
  language = {en},
}