@misc{1191506,
  author = {Frank H Day},
  title = {Circular of the Bureau of Standards no. 507::x-ray calibration of radiation survey meters, pocket chambers, and dosimeters},
  year = {1951},
  month = {1951-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CIRC.507},
  language = {en},
}