@misc{1154176,
  author = {James A Barnes},
  title = {The standards of time and frequency in the U.S. A.:},
  year = {1974},
  month = {1974-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.649},
  language = {en},
}