@misc{1156296,
  author = {Sanford Charles Gladden},
  title = {A history of vertical-incidence ionsphere sounding at the National Bureau of Standards.:},
  year = {1959},
  month = {1959-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.28},
  language = {en},
}