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Research paper published - German interwar autogyro development
https://www.aerosociety.com/publicat...ler-1890-1937/
Research paper published in the Journal of Aeronautical History by Berend G van der Wall and Wulf Mönnich on The Aircraft, the Rotorcraft and the Life of Walter Rieseler 1890-1937.
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 author of THE DECISIVE DUEL: SPITFIRE VS 109, published by Little Brown. Visit its website at: http://Spitfirevs109.com
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