TY  - RPRT
TI  - Prototype ultrasonic instrument for quantitative testing
AU  - Lynworth, L. C.
AU  - Dubois, J. L.
AU  - Kranz, P. R.
PY  - 1973
UR  - https://ntrs.nasa.gov/citations/19730000051
ID  - 19730000051
ER  -