@misc{1187681,
  author = {James R Clifton},
  title = {Nondestructive test to determine concrete strength- a status report:},
  year = {1975},
  month = {1975-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.75-729},
  language = {en},
}