TY  - RPRT
TI  - Fractographic examination of failed helicopter tail rotor hub yoke 
AU  - Shives, T Robert
PY  - 1974
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 74-441
DO  - 10.6028/NBS.IR.74-441
ER  -