Helicopters at work
by Mary Elting
Examines the varied uses of helicopters for scientific research, fire fighting, pest control, rescue operations, drilling and pipelining, sight-seeing, and others.
HelicoptersJuvenile literature
by Mary Elting
Examines the varied uses of helicopters for scientific research, fire fighting, pest control, rescue operations, drilling and pipelining, sight-seeing, and others.