German Armored Warplanes: A Centennial Perspective on Great War Airplanes
German Armored Warplanes of WWI: A Centennial Perspective on Great War Airplanes: 4 (Great War Aviation Series) by
Jack Herris,
Jerry Boucher,
Bob Pearson ISBN: 1935881116
on January 1st 1970
Len's Summary: Wood and canvas gave way to aluminum and steel airframe construction as aircraft were increasingly employed in a ground-support role.
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