Aviation interest - A. Riedinger, BallonFabrik, Ausberg, 129p, blue paper cover with string binding, gold-stamped image to front cover, undated c.1905, German text, with many illustrations, fold out diagrams, details of the balloonist's equipment, history of the balloon flight, technical data and tables, construction sketches etc.. Along with ‘Aviatik, 16 Sonderheft der Woche, Berlin, undated but c. 1909, 63p, A4 brochure (with cover illustration by Hans Rudi Erdt) with numerous photo illustrations showing the early days of aviation with various flying machines