@misc{1152646,
  author = {D J Chwirut},
  title = {Procedures for the calibration of ASTM E127-Type ultrasonic reference blocks:},
  year = {1976},
  month = {1976-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.924},
  language = {en},
}