Collection of stamps cards and covers illustrating the development of international air post 1870-1950

Collection of stamps cards and covers illustrating the development of international air post 1870-1950 / amassed by Miss Winifred Penn-Gaskell. 71: Folder of 96 propaganda leaflets, dropped from balloons, and from both German and Allied aircraft, during World War I, 1914-1918. Including: relics of a Zeppelin airship shot down over Belgium 1915; woodblock satirical cartoon prints; Spartacus movement; Bolshevik message to German troops. With three World War II items added (see also 1950-317/82). [Titled on cover] Originalfliegerabwurfe und illegale Flugblatter aus dem Weltkriege. Listed