Birdflight as the basis of aviation;
a contribution towards a system of aviation, compiled from the results of numerous experiments made by O. and G. Lilienthal /
by Otto Lilienthal; with a biographical introduction and addendum by Gustav Lilienthal ... tr. from the 2d ed. by A. W. Isenthal ... With 1 portrait, 94 illustrations, and 8 litho. plates.

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