Detailed collection of Air Mail Covers

Detailed collection of Air Mail Covers, Vignettes and documents, in ten volumes, covering the British Isles, and showing the advancement of Internal Commercial Air Services from their inception on April 15th 1933 to the war period 1939/40 constituting the First Phase. / amassed by G Leigh Walker [most by 1936 when exhibited in New York]. Summary Handlist. For further details see 1948-272/1 to /10