Helicopter noise in the London area report by a working group of the [Noise Advisory] Council [i.e. the Working Group on Noise from Air Traffic]
Noise Advisory Council.Working Group on Noise from Air Traffic.
Lilley, Geoffrey Michael.
Great Britain.Department of the Environment.
London H.M.S.O. for the Department of the Environment
1977
Chairman of the working group: G.M. Lilley
Helicopters