Solff, Oberleutnant S. Motorluftschiffe und Flugmaschinen. (Flying Machines and Motors). Berlin/Leipzip, Herman Hillger, ca. 1909. 95pp, illus, 5x7", wrps. Section on lighter-than-air and another on heavier-than-air. About good, some small edge tears.
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23-CAT-31
