@misc{1191116,
  author = {W B Mann},
  title = {Circular of the Bureau of Standards no. 594::preparation, maintenance, and application of standards of radioactivity},
  year = {1958},
  month = {1958-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CIRC.594},
  language = {en},
}