@misc{1154691,
  author = {Geraldine W Haupt},
  title = {Glass limit standards deposited at NBS for railway, highway and airways traffic signal colors ::history, permanence and colorimetric properties},
  year = {1971},
  month = {1971-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.564},
  language = {en},
}