Airscrews GENERAL 624. Emission of sound by airscrews. (With diagrams.) March 1919. (4d.).
(1931), "Research Work in England: A Guide to the Work Carried out by the Aeronautical Research Committee", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 7, pp. 176-178. https://doi.org/10.1108/eb029427Download as .RIS
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