@misc{1191901,
  author = {E R Weaver},
  title = {Circular of the Bureau of Standards no. 420::propane, butane, and related fuels},
  year = {1938},
  month = {1938-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CIRC.420},
  language = {en},
}