@misc{1168891,
  author = {E W Crouch},
  title = {Study of optical system for airport traffic signal projector:},
  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.3087},
  language = {en},
}