@misc{1173591,
  author = {PR Heyl},
  title = {Letter Circular 205::sound proof partitions},
  year = {1926},
  month = {1926-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.LCIRC.205},
  language = {en},
}