@misc{1191856,
  author = {Martin Shepherd},
  title = {Circular of the Bureau of Standards no. 430::glass stopcocks},
  year = {1941},
  month = {1941-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CIRC.430},
  language = {en},
}