@misc{1173631,
  author = {Harold Berger},
  title = {Letter Circular 1068::the National Bureau of Standards program in nondestructive evaluation},
  year = {1980},
  month = {1980-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.LCIRC.1068},
  language = {en},
}