Gliding, flapping and propelled flight used by birds in air; some better adapted than others to one or another of these processes; resources for maneuvering make of them gliders, airplanes, or helicopters.
Scientific studies of natural flight
Mech. Eng
Mechanical Engineering ; 51 , n 10
1929
4 pages
7 Figs.
Aufsatz (Zeitschrift)
Englisch
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