@misc{1184511, author = {Daniel J Chwirut and Gary D Boswell}, title = {The evaluation of search units used for ultrasonic reference block calibrations:}, year = {1978}, month = {1978-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.78-1454}, language = {en}, }