Helicopters
by David Petersen · 1983
Popularity 1
Highlights basic information about the history of helicopters, their parts and how they function, and the types and uses of whirlybirds.
HelicoptersJuvenile literature
by David Petersen · 1983
Highlights basic information about the history of helicopters, their parts and how they function, and the types and uses of whirlybirds.