TY  - RPRT
TI  - Fractography of a 7178-T6 aluminum failed wing plank 
AU  - Ballard, D B
PY  - 1968
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 9911
DO  - 10.6028/NBS.RPT.9911
ER  -