TY  - RPRT
TI  - An assessment of ultrasonic reference block calibration methodology 
AU  - Blessing, G V
PY  - 1983
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 83-2710
DO  - 10.6028/NBS.IR.83-2710
ER  -