TY  - RPRT
TI  - The evaluation of search units used for ultrasonic reference block calibrations 
AU  - Chwirut, Daniel J
AU  - Boswell, Gary D
PY  - 1978
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 78-1454
DO  - 10.6028/NBS.IR.78-1454
ER  -