Die Biotechnik des Fliegens.
Leipzig: Voigtländer, 1925. 8vo. [8, inc. frontis.], 104pp. Text illust. 216 x 166 mm. Orig. cloth, a little worn. VG. Very scarce. More
Leipzig: Voigtländer, 1925. 8vo. [8, inc. frontis.], 104pp. Text illust. 216 x 166 mm. Orig. cloth, a little worn. VG. Very scarce. More