Details
Der Auto Pionier auf Viktoria von Carl Benz, Mannheim (Theodor Liebig) 1st edition with authors signed dedication to "Ing. Ferdinand Porsche" 1908; with Die Motor Fahrtzeuge (Wolfram) illustrated working mechanisms of the motor vehicle, c1936; and with Allgemeiner Schnauferl Club Lexicon A-Z 1934. (3)