London: Putnam Aeronautical Books, 2004. . Griehl, Manfred and Joachim Dressel. Zeppelin! The German Airship Story. London: Arms & Armour, 1990. . McPhee, John. The Deltoid Pumpkin Seed. London: Farrar, Straus and Giroux, 1992. . Mowthorpe, Ces. Battlebags: British Airships of the First World War (An Illustrated History). London: Sutton Publishing, 1995. . Danish Post & Tele Museum Zeppelin articles "Zeppelin Exhibition – An online exhibition about Zeppelins." Post & Tele Museum, Denmark. Patents , "Navigable balloon". 14 March 1899. Ferdinand Graf Zeppelin. , "Method of destroying aircraft", Filed 11 April 1916. Joseph A. Steinmetz , "Light weight girder". Filed 28 June 1920. Karl Arnstein. , "Airship". Filed 19 August 1922; Issued 20 November 1923. Julius Erhardt , "Rigid airship with separate gas cells". Filed 27 November 1922; Issued August 1929. Hugo Eckener External links How did London civilians respond to the German airship raids of 1915? Zeppelin NT in the World and Technical Data Airships.net – Illustrated history of passenger Zeppelins eZEP.de – The webportal for Zeppelin mail and airship memorabilia Zeppelin Post Journal – Quarterly publication for Zeppelin mail and airship memorabilia Zeppelin Luftschifftechnik GmbH – The original company, now developing the Zeppelin NT Dark Autumn: The 1916 German Zeppelin Offensive Die deütschen Luftstreitkräfte im Weltkriege edited by Georg Paul Neumann 1920 [German][Books google]. Vehicles introduced in 1900 Air freight Aviation in World War I 20th century in Germany 20th-century German aviation