@misc{1168606,
  author = {F C Breckenridge},
  title = {Improvement of visual aids for air navigation ::progress report March 1, 1954 to June 30, 1954},
  year = {1954},
  month = {1954-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.3647},
  language = {en},
}