DISCUSSION OF 6858 AND 6921. HELIPORTS IN URBAN AREAS. STRUCTURAL TESTS ON AN EXPERIMENTAL HELICOPTER PLATFORM.
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H J B Harding | G W Rooke | D H Little | R J Mainstone | N Borg | A J Dutt | E H Lewis Dale | R W S Thorley | G S Cooper | G N Coulter | G A Weeks | H P Finch