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FLUGBAHN-BERECHNUNG EINES ZWEISTUFIGEN RAKETEN-MODELLS [cover title].
Bremen: Anschrift des Verfassers: Obering. Herm. Langkrär, Sept. 1973. Octavo, 1-28 leaves (printed on rectos only), pagination includes two folded tables, original gray pictorial wrappers printed in black. First edition. (#135435)
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