@misc{1187446,
  author = {John V Fechter and Valom J Pezoldt and J J Persensky and J Richard Lepkowski},
  title = {Study of the national standards for directional and other official signs ::overview of their adequacy},
  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.IR.75-777},
  language = {en},
}