[Collection of air mail covers, stamps and documents showing the development of commercial air transport in the British Isles 1933-1940] / amassed by G. Leigh Walker. Volume 10: International Stamp Exhibition 1923. War Loan. Autogiro Mail. Rocket Post 1934. 15 leaves; each 35.5x26cm in album 37x32x6cm. Rocket Post 1923-1934