Der Vogelflug als Grundlage der Fliegekunst Ein Beitrag zur Systematik der Flugtechnik

The Romance of Aircraft

Artificial and Natural Flight

Birds in Flight

The Aeroplane

Flying Machines Today

Balloons, Airships, and Flying Machines

Animal Locomotion; or, walking, swimming, and flying With a dissertation on aëronautics

Aërial Navigation A Popular Treatise on the Growth of Air Craft and on Aëronautical Meteorology

Learning to fly in the U.S. Army

Aircraft