TY  - BOOK
AU  - Wagtendonk,W.J.
TI  - Principles of helicopter flight
SN  - 1560276495
U1  - 629.1325252 23
PY  - 2006///
CY  - Washington : 
PB  - Aviation Supplies & Academics , 
KW  - Helicopters - Aerodynamics
ER  -