@misc{1167936,
  author = {Harry J Keegan and Gladys M Haas and Wiley A Hall},
  title = {Spectrophotometric and colorimetric study of color transparencies of some natural objects:},
  year = {1957},
  month = {1957-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.4794},
  language = {en},
}