TY  - RPRT
TI  - an appraisal of current and future needs in ultrasonic NDE standards 
AU  - Birnbaum, G
AU  - Eitzen, D G
PY  - 1979
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 79-1907
DO  - 10.6028/NBS.IR.79-1907
ER  -