TY  - BOOK
AU  - Laskowitz, Isidor B.
AU  - Whipple, Harold E.
TI  - VERTICAL TAKE-OFF AND LANDING (VTOL) AIRCRAFT
U1  - 629.535 
PY  - 1963///
CY  - N. Y.
PB  - New York Academy Of Science
KW  - Helicopters
ER  -